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Depending on your package’s size, weight, and destination, some options may be more affordable than others.
USPS First Class Mail is a budget-friendly option for shipping smaller items weighing under 16 ounces. Packages must be smaller than 22″ x 18″ x 15″ and typically arrive within 3-4 business days.
USPS Priority Mail Express has the same size and weight limits as Priority Mail but offers faster delivery. Packages typically arrive within 1-2 business days.
USPS Priority Mail is ideal for shipping parcels up to 70 pounds domestically. Packages can’t exceed 108 inches in length and girth combined. Delivery usually takes 1-3 business days.
USPS Parcel Select is a cost-effective option for shipping large parcels up to 70 pounds. Packages can be up to 130 inches in size and typically take 2-8 business days to deliver.
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The USPS charges by both weight and package size. While there are generally weight thresholds that determine rates, there are more factors to be aware of. If packages are small but heavy, they may receive cubic pricing discounts. Conversely, if a package is lightweight but large, dimensional weight may increase the rates. For a full breakdown of ShipStation’s USPS rates, read our guide to USPS rates.
Shipping rates are determined by package a package’s weight, dimensions, rate tier, and the distance between the ship-from and ship-to location (referred to as a zone).
The maximum allowable size for many mailpieces is 108” in combined length and girth (the distance around the thickest part of a package). USPS Retail Ground can measure up to 130” in combined length and girth, but this is subject to oversized pricing. Regardless, the heaviest a Priority Mail parcel may weigh is 70 lbs.
