The chart below shows USPS Package Restrictions for all their major packaging options. These are the weight and dimensional limits to what USPS allows.
The Predefined Package names are drawn from the EasyPost API, so you can better reference how each Predefined Package matches up dimensionally.
Predefined Package Name | Dimensions | Weight |
---|---|---|
Card |
| Must be a flat surface |
Letter |
| Maximum weight is 3.5 oz. |
Flat |
| Maximum weight of 13 oz. |
Parcel | Maximum size is 108" in combined length and girth (distance around the thickest part). First-Class™ packages cannot exceed 22" x 18" x 15". | Contents for Priority Mail Express, Priority Mail, or Media Mail® must weigh less than 70 lbs. First-Class™ packages must weigh less than 16 oz. |
LargeParcel [1][3] | Maximum size is 130" in combined length and girth (distance around the thickest part). | Contents must weigh less than 70 lbs. |
IrregularParcel [1][2] |
| Contents must weigh less than 16 oz. |
FlatRateEnvelope | 12 ½" x 9 ½" |
|
FlatRateLegalEnvelope | 15" x 9 ½" |
|
FlatRatePaddedEnvelope | 12 ½" x 9 ½" |
|
FlatRateGiftCardEnvelope | 10" x 7" |
|
FlatRateWindowEnvelope | 10" x 5" |
|
FlatRateCardboardEnvelope | 12 ½" x 9 ½" |
|
SmallFlatRateEnvelope | 12 ½" x 9 ½" |
|
SmallFlatRateBox | 8 ⅝" x 5 ⅜" x 1 ⅝" | Contents must weigh less than 70 lbs. |
MediumFlatRateBox | 11" x 8 ½" x 5 ½" | Contents must weigh less than 70 lbs. |
LargeFlatRateBox | 12" x 12" x 5 ½" | Contents must weigh less than 70 lbs. |
RegionalRateBoxA [1] |
| Contents must weigh less than 15 lbs. |
RegionalRateBoxB [1] |
| Contents must weigh less than 20 lbs. |
LargeFlatRateBoardGameBox |
| Contents must weigh less than 70 lbs. |
[1] Not available for international shipments.
[2] Only used with Parcel Select Lightweight.
[3] Marks package for Balloon Price.
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