{"id":83470,"date":"2026-04-17T08:39:44","date_gmt":"2026-04-17T13:39:44","guid":{"rendered":"https:\/\/www.shipstation.com\/?page_id=83470"},"modified":"2026-04-27T17:05:16","modified_gmt":"2026-04-27T22:05:16","slug":"usps-priority-mail-large-flat-rate-box","status":"publish","type":"page","link":"https:\/\/www.shipstation.com\/en-ca\/fulfillment\/shipping\/usps-priority-mail-large-flat-rate-box\/","title":{"rendered":"USPS Priority Mail Large Flat Rate Box Guide"},"content":{"rendered":"\n<section class=\"wp-block-shipstation-hero block not-prose padding-top--lg padding-bottom--sm\">\n    <div class=\"\">\n        <div class=\"container\">\n            <div class=\"hero items-start\">\n                <div class=\"hero-content \">\n                                                                    <h1>USPS\u00ae Priority Mail Large Flat Rate Box Shipping Without Guesswork<\/h1>\n                                                    <div class=\"lead\"><p>The USPS Priority Mail Large Flat Rate Box gives you predictable Priority Mail speed with one simple rate for the box, even when your order gets heavy. With ShipStation, you can compare USPS rates against other carriers, and print labels faster from one dashboard.<\/p><\/div>\n                                                                                    <div class=\"btn-group\">\n                                                                                    <a href=\"\/start-a-free-trial\/\" class=\"btn btn--primary\" target=\"_self\">\n                                    Start a Free Trial                                <\/a>\n                                                                            \n                                                                                    <a href=\"\/contact-us\/\" class=\"btn outline btn--secondary\" target=\"_self\">\n                                    Request a Demo                                <\/a>\n                                                                        <\/div>\n                                \n                            <\/div>\n                    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width=\"94\" \n                                                 height=\"94\" \n                                                 loading=\"lazy\" \/>\n                                        <\/li>\n                                                                                                                                                <li>\n                                            <img decoding=\"async\" src=\"https:\/\/www.shipstation.com\/wp-content\/uploads\/2026\/04\/Salesforce-icon-card.svg\" \n                                                 alt=\"Salesforce logo\" \n                                                 width=\"94\" \n                                                 height=\"94\" \n                                                 loading=\"lazy\" \/>\n                                        <\/li>\n                                                                                                                                                <li>\n              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                   loading=\"lazy\" \/>\n                                        <\/li>\n                                                                                                                                                <li>\n                                            <img decoding=\"async\" src=\"https:\/\/www.shipstation.com\/wp-content\/uploads\/2026\/04\/Woo-commerce-icon-card.svg\" \n                                                 alt=\"Woo Commerce logo\" \n                                                 width=\"94\" \n                                                 height=\"94\" \n                                                 loading=\"lazy\" \/>\n                                        <\/li>\n                                                                                                                                                <li>\n                                            <img decoding=\"async\" src=\"https:\/\/www.shipstation.com\/wp-content\/uploads\/2026\/04\/Tiktok-icon-card.svg\" \n                                                 alt=\"TikTok logo\" \n                                                 width=\"94\" \n                                                 height=\"94\" \n                                                 loading=\"lazy\" \/>\n                                        <\/li>\n                                                                                                <\/ul>\n                                            <\/div>\n                <\/div>\n            <\/div> <!-- Close logo-marquee -->\n            <\/div> <!-- Close container -->\n        <\/div>\n    <\/div>\n<\/section>\n\n\n<style>\n.wp-block-shipstation-logo-marquee .container .logo-marquee .fade-edges .slider>ul>li img {<br \/>\n    min-height: 120px;<br \/>\n}<br \/>\n<\/style>\n\n\n<section class=\"wp-block-shipstation-cards-v2 block not-prose\" id=\"block-cards-6a1bfc93d09ee\">\n            <div class=\"bg-grey-lightest background--full content-theme--light  \">\n        <div class=\"container\">\n                        <div class=\"content content-align-center items-center\">\n                                \n                                    <h2>Predictable shipping, faster days in the warehouse<\/h2>\n                                \n                                    <div class=\"lead\"><p>When you want cost control and quick delivery, ShipStation helps you choose the right Flat Rate option, automate decisions, and reduce clicks across your workflow while keeping buyers updated with branded tracking.<\/p><\/div>\n                                \n                                \n                            <\/div>\n                        \n                                                <!-- Grid Mode -->\n                    <div class=\"cards icon-top columns-3 layout-grid\">\n                                                                                <div class=\"card card-icon card-solid card--centered card--text-centered bg-white\">\n                                \n        <img decoding=\"async\" src=\"https:\/\/www.shipstation.com\/wp-content\/smush-webp\/2026\/02\/icon-bbd4cfaccc8a.png.webp\" alt=\"\" class=\"icon\" loading=\"eager\" \/>\n    \n\n\n\n\n\n<div class=\"card-content h-full\">\n        <div class=\"card-text\">\n                    <!-- Standard heading\/eyebrow for all other card types -->\n            \n                                                <h3 class=\"h5\">Know the rate before you tape the box<\/h3>\n                                            \n                    <div class=\"body\"><p>When you choose the Large Flat Rate Box, ShipStation shows the rate inside your workflow. Plan margin and shipping charges with confidence. You can also compare costs against other carriers in real time.<\/p><\/div>\n        \n            <\/div>\n\n    <\/div>\n                            <\/div>\n                                                                                                            <div class=\"card card-icon card-solid card--centered card--text-centered bg-white\">\n                                \n        <img decoding=\"async\" src=\"https:\/\/www.shipstation.com\/wp-content\/smush-webp\/2026\/03\/icon-7ed5d0c30edd.png.webp\" alt=\"\" class=\"icon\" loading=\"eager\" \/>\n    \n\n\n\n\n\n<div class=\"card-content h-full\">\n        <div class=\"card-text\">\n                    <!-- Standard heading\/eyebrow for all other card types -->\n            \n                                                <h3 class=\"h5\">Move from paid order to printed label, fast<\/h3>\n                                            \n                    <div class=\"body\"><p>Avoid retyping addresses or switching between tabs. ShipStation pulls orders from your stores and marketplaces, then lets you create labels one at a time or in batches. Use automation and presets to create up to 15x more labels per hour. Reduce manual steps. Minimize errors\u2014so your team can ship quickly even during high-volume periods.<\/p><\/div>\n        \n            <\/div>\n\n    <\/div>\n                            <\/div>\n                                                                                                            <div class=\"card card-icon card-solid card--centered card--text-centered bg-white\">\n                                \n        <img decoding=\"async\" src=\"https:\/\/www.shipstation.com\/wp-content\/smush-webp\/2026\/04\/icon-8a5fbc7ec2d8.png.webp\" alt=\"\" class=\"icon\" loading=\"eager\" \/>\n    \n\n\n\n\n\n<div class=\"card-content h-full\">\n        <div class=\"card-text\">\n                    <!-- Standard heading\/eyebrow for all other card types -->\n            \n                                                <h3 class=\"h5\">Keep your brand in the box experience<\/h3>\n                                            \n                    <div class=\"body\"><p>The label is only part of the moment. With branded tracking pages and notifications, your customer sees your logo and tone, not a generic carrier page. Add returns workflows so customers can self-serve and you spend less time on &#8220;Where&#8217;s my order?&#8221; emails.<\/p><\/div>\n        \n            <\/div>\n\n    <\/div>\n                            <\/div>\n                                                                        <\/div>\n                            \n                    <\/div>\n    <\/div>\n<\/section>\n\n\n\n<section class=\"block block-zig-zag wp-block-shipstation-zig-zag block not-prose\">\n    <div class=\"bg-grey-lightest background--full content-theme--light content--lg \">\n        <div class=\"zig-zag-block\">\n            <div class=\"container\">\n                    <div class=\"content content-align-center items-center content-width-md\">\n                                        \n                                            <h2>Get Flat Rate right with USPS tools that scale<\/h2>\n                                        \n                                            <div class=\"lead\">From setup to label creation, ShipStation makes it easy to choose the right Flat Rate option, automate decisions, and batch print labels. Compare rates across carriers like UPS\u00ae, FedEx\u00ae, and DHL Express\u00ae to ensure every shipment uses the best option.<\/div>\n                                        \n                                        \n                                    <\/div>\n                <div class=\"columns flex-col-reverse items-center zig-zag-row\" data-row=\"1\">\n            \n            <!-- Text Column -->\n            <div class=\"column-content w-full md:col-span-6 md:order-1 content-align-left mobile-align-left\">\n                                \n                                    <h3>What is the USPS Priority Mail Large Flat Rate Box<\/h3>\n                                \n                                    <div class=\"lead max-w-[54rem]\">\n                        <p>It\u2019s USPS packaging that ships for a set Flat Rate when you use Priority Mail. The main win is predictability: price is based on the box, not distance, making it a strong choice for dense or heavy orders.<\/p>                    <\/div>\n                                \n                                \n                            <\/div>\n\n            <!-- Media Column -->\n            <div class=\"column-media w-full md:col-span-6 md:order-2\">\n                                    <img decoding=\"async\" src=\"https:\/\/www.shipstation.com\/wp-content\/uploads\/2026\/04\/what-is-the-usps-priority-mail-large-flat-rate-box-260417-0834.webp\" alt=\"\" class=\"rounded-xl\" \/>\n                            <\/div>\n\n        <\/div>\n            <div class=\"columns flex-col-reverse items-center zig-zag-row\" data-row=\"2\">\n            \n            <!-- Text Column -->\n            <div class=\"column-content w-full md:col-span-6 md:order-2 content-align-left mobile-align-left\">\n                                \n                                    <h3>Priority Mail Large Flat Rate Box dimensions<\/h3>\n                                \n                                    <div class=\"lead max-w-[54rem]\">\n                        <p>USPS offers more than one Large Flat Rate Box style, and the exact priority mail large flat rate box dimensions are printed on the box you&#8217;re holding. Measure your packed box and match it to the correct package type in ShipStation so your label and acceptance scan go smoothly.<\/p>                    <\/div>\n                                \n                                \n                            <\/div>\n\n            <!-- Media Column -->\n            <div class=\"column-media w-full md:col-span-6 md:order-1\">\n                                    <img decoding=\"async\" src=\"https:\/\/www.shipstation.com\/wp-content\/uploads\/2026\/04\/priority-mail-large-flat-rate-box-dimensions-260417-0834.webp\" alt=\"\" class=\"rounded-xl\" \/>\n                            <\/div>\n\n        <\/div>\n            <div class=\"columns flex-col-reverse items-center zig-zag-row\" data-row=\"3\">\n            \n            <!-- Text Column -->\n            <div class=\"column-content w-full md:col-span-6 md:order-1 content-align-left mobile-align-left\">\n                                \n                                    <h3>USPS Large Flat Rate Box shipping cost<\/h3>\n                                \n                                    <div class=\"lead max-w-[54rem]\">\n                        <p>Flat Rate is about simple math. Cost is set by the Flat Rate product, so you can forecast spend without guessing zones. In ShipStation, the rate shows while you rate shop, helping you compare services and review cost and pricing across orders.<\/p>                    <\/div>\n                                \n                                \n                            <\/div>\n\n            <!-- Media Column -->\n            <div class=\"column-media w-full md:col-span-6 md:order-2\">\n                                    <img decoding=\"async\" src=\"https:\/\/www.shipstation.com\/wp-content\/uploads\/2026\/04\/usps-large-flat-rate-box-shipping-cost-260417-0834.webp\" alt=\"\" class=\"rounded-xl\" \/>\n                            <\/div>\n\n        <\/div>\n            <div class=\"columns flex-col-reverse items-center zig-zag-row\" data-row=\"4\">\n            \n            <!-- Text Column -->\n            <div class=\"column-content w-full md:col-span-6 md:order-2 content-align-left mobile-align-left\">\n                                \n                                    <h3>Weight limits for Priority Mail Large Flat Rate Box<\/h3>\n                                \n                                    <div class=\"lead max-w-[54rem]\">\n                        <p>USPS allows heavy packages in Flat Rate packaging, up to the Priority Mail limit of 70 lbs. That makes the Large Flat Rate Box popular for compact, weighty items. In ShipStation, you can use the weight limit for large flat rate box shipments as a rule trigger to automatically assign Flat Rate packaging and reduce manual decisions.<\/p>                    <\/div>\n                                \n                                \n                            <\/div>\n\n            <!-- Media Column -->\n            <div class=\"column-media w-full md:col-span-6 md:order-1\">\n                                    <img decoding=\"async\" src=\"https:\/\/www.shipstation.com\/wp-content\/uploads\/2026\/04\/weight-limits-for-priority-mail-large-flat-rate-box-260417-0834.webp\" alt=\"\" class=\"rounded-xl\" \/>\n                            <\/div>\n\n        <\/div>\n            <div class=\"columns flex-col-reverse items-center zig-zag-row\" data-row=\"5\">\n            \n            <!-- Text Column -->\n            <div class=\"column-content w-full md:col-span-6 md:order-1 content-align-left mobile-align-left\">\n                                \n                                    <h3>When to use a large flat rate box for shipping<\/h3>\n                                \n                                    <div class=\"lead max-w-[54rem]\">\n                        <p>Use it when weight climbs and you want steady pricing and fast delivery. It&#8217;s often a good fit for items like:<\/p><ul><li>Small hardware, tools, and auto parts that are dense<\/li><li>Bundled apparel, books, or boxed sets that pack tight<\/li><\/ul><p>If your item is big but light, you may save more with other packaging and services.<\/p>                    <\/div>\n                                \n                                \n                            <\/div>\n\n            <!-- Media Column -->\n            <div class=\"column-media w-full md:col-span-6 md:order-2\">\n                                    <img decoding=\"async\" src=\"https:\/\/www.shipstation.com\/wp-content\/uploads\/2026\/04\/when-to-use-a-large-flat-rate-box-for-shipping-260417-0834.webp\" alt=\"\" class=\"rounded-xl\" \/>\n                            <\/div>\n\n        <\/div>\n            <div class=\"columns flex-col-reverse items-center zig-zag-row\" data-row=\"6\">\n            \n            <!-- Text Column -->\n            <div class=\"column-content w-full md:col-span-6 md:order-2 content-align-left mobile-align-left\">\n                                \n                                    <h3>Print Priority Mail Flat Rate Labels with ShipStation<\/h3>\n                                \n                                    <div class=\"lead max-w-[54rem]\">\n                        <p>Ready to ship? Connect your stores through integrations, pull orders into one grid, then print single labels or run batch label printing for the day&#8217;s shipments. Add automation rules based on weight, SKU, tag, or destination\u2014so every order gets the right service automatically.<\/p>                    <\/div>\n                                \n                                \n                            <\/div>\n\n            <!-- Media Column -->\n            <div class=\"column-media w-full md:col-span-6 md:order-1\">\n                                    <img decoding=\"async\" src=\"https:\/\/www.shipstation.com\/wp-content\/uploads\/2026\/04\/print-priority-mail-flat-rate-labels-with-shipstation-260417-0834.webp\" alt=\"\" class=\"rounded-xl\" \/>\n                            <\/div>\n\n        <\/div>\n                <\/div>\n        <\/div>\n    <\/div>\n<\/section>\n\n\n\n<section class=\"wp-block-shipstation-faqs block not-prose padding-top--md padding-bottom--md\">\n    <div class=\"background--full content--md\">\n        <div class=\"accordion-block\">\n            <div class=\"container\">\n                    <div class=\"content content-align-center items-center content-width-md\">\n                                        \n                                            <h2>FAQs about USPS Priority Mail Large Flat Rate Box shipping<\/h2>\n                                        \n                                        \n                                        \n                                    <\/div>\n                        <div class=\"accordions\">\n                                            <div class=\"accordion\">\n                            <div class=\"question\" role=\"button\" tabindex=\"0\" aria-expanded=\"false\">\n                                <h5>What&#039;s the weight limit for large flat rate box shipments?<\/h5>\n                                <div class=\"icon\">\n                                    <svg class=\"span-2\" width=\"16\" height=\"17\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" fill=\"none\" viewBox=\"0 0 24 24\" stroke-width=\"1.5\" stroke=\"currentColor\">\n                                        <path stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M19.5 8.25l-7.5 7.5-7.5-7.5\" \/>\n                                    <\/svg>\n                                <\/div>\n                            <\/div>\n                            <div class=\"body-content\">\n                                <div class=\"prose\">The Large Flat Rate Box supports heavy shipments up to the USPS Priority Mail Flat Rate limit of 70 lbs. Confirm your packed weight, tape seams well, and avoid bulging. If it won&#8217;t close normally, pick a different box.<\/div>\n                            <\/div>\n                        <\/div>\n                                            <div class=\"accordion\">\n                            <div class=\"question\" role=\"button\" tabindex=\"0\" aria-expanded=\"false\">\n                                <h5>Can I use a Large Flat Rate Box with USPS services other than Priority Mail?<\/h5>\n                                <div class=\"icon\">\n                                    <svg class=\"span-2\" width=\"16\" height=\"17\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" fill=\"none\" viewBox=\"0 0 24 24\" stroke-width=\"1.5\" stroke=\"currentColor\">\n                                        <path stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M19.5 8.25l-7.5 7.5-7.5-7.5\" \/>\n                                    <\/svg>\n                                <\/div>\n                            <\/div>\n                            <div class=\"body-content\">\n                                <div class=\"prose\">No. They are only an option when you select USPS Priority Mail in ShipStation. If you choose another service, the Flat Rate option won\u2019t apply.<\/div>\n                            <\/div>\n                        <\/div>\n                                            <div class=\"accordion\">\n                            <div class=\"question\" role=\"button\" tabindex=\"0\" aria-expanded=\"false\">\n                                <h5>Do I need to enter dimensions for a Flat Rate box?<\/h5>\n                                <div class=\"icon\">\n                                    <svg class=\"span-2\" width=\"16\" height=\"17\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" fill=\"none\" viewBox=\"0 0 24 24\" stroke-width=\"1.5\" stroke=\"currentColor\">\n                                        <path stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M19.5 8.25l-7.5 7.5-7.5-7.5\" \/>\n                                    <\/svg>\n                                <\/div>\n                            <\/div>\n                            <div class=\"body-content\">\n                                <div class=\"prose\">Flat Rate pricing is tied to the package type, but shipment data still matters. Be sure to enter accurate details when you ship. Clean inputs help prevent adjustments and keep rate comparisons reliable.<\/div>\n                            <\/div>\n                        <\/div>\n                                            <div class=\"accordion\">\n                            <div class=\"question\" role=\"button\" tabindex=\"0\" aria-expanded=\"false\">\n                                <h5>How do I compare Priority Mail Flat Rate shipping costs to other carriers?<\/h5>\n                                <div class=\"icon\">\n                                    <svg class=\"span-2\" width=\"16\" height=\"17\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" fill=\"none\" viewBox=\"0 0 24 24\" stroke-width=\"1.5\" stroke=\"currentColor\">\n                                        <path stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M19.5 8.25l-7.5 7.5-7.5-7.5\" \/>\n                                    <\/svg>\n                                <\/div>\n                            <\/div>\n                            <div class=\"body-content\">\n                                <div class=\"prose\">In ShipStation, you can rate shop in the same screen where you create labels. Compare Flat Rate against services from USPS, UPS, FedEx, and DHL Express without leaving your workflow.<\/div>\n                            <\/div>\n                        <\/div>\n                                            <div class=\"accordion\">\n                            <div class=\"question\" role=\"button\" tabindex=\"0\" aria-expanded=\"false\">\n                                <h5>What are the best products to ship in flat rate boxes?<\/h5>\n                                <div class=\"icon\">\n                                    <svg class=\"span-2\" width=\"16\" height=\"17\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" fill=\"none\" viewBox=\"0 0 24 24\" stroke-width=\"1.5\" stroke=\"currentColor\">\n                                        <path stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M19.5 8.25l-7.5 7.5-7.5-7.5\" \/>\n                                    <\/svg>\n                                <\/div>\n                            <\/div>\n                            <div class=\"body-content\">\n                                <div class=\"prose\">Dense items that pack tight tend to win. Think parts, kits, and bundles that would be pricey by distance-based rates. For light items, other services may be more cost-effective.<\/div>\n                            <\/div>\n                        <\/div>\n                                            <div class=\"accordion\">\n                            <div class=\"question\" role=\"button\" tabindex=\"0\" aria-expanded=\"false\">\n                                <h5>How does ShipStation help with returns after I ship Flat Rate orders?<\/h5>\n                                <div class=\"icon\">\n                                    <svg class=\"span-2\" width=\"16\" height=\"17\" xmlns=\"http:\/\/www.w3.org\/2000\/svg\" fill=\"none\" viewBox=\"0 0 24 24\" stroke-width=\"1.5\" stroke=\"currentColor\">\n                                        <path stroke-linecap=\"round\" stroke-linejoin=\"round\" d=\"M19.5 8.25l-7.5 7.5-7.5-7.5\" \/>\n                                    <\/svg>\n                                <\/div>\n                            <\/div>\n                            <div class=\"body-content\">\n                                <div class=\"prose\">Use branded tracking and a returns portal to reduce support load. Your customer can start a return, follow updates, and stay inside your brand. Your team gets cleaner workflows and fewer manual emails.<\/div>\n                            <\/div>\n                        <\/div>\n                                    <\/div>\n            <\/div>\n        <\/div>\n    <\/div>\n<\/section>\n","protected":false},"excerpt":{"rendered":"<p>Learn when to use the USPS Priority Mail Large Flat Rate Box and how ShipStation helps automate labels and compare shipping costs.<\/p>\n","protected":false},"author":134,"featured_media":83428,"parent":74029,"menu_order":0,"comment_status":"closed","ping_status":"closed","template":"","meta":{"_acf_changed":false,"_yoast_wpseo_metadesc":"Learn when to use the USPS Priority Mail Large Flat Rate Box and how ShipStation helps automate labels and compare shipping 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