What are the USPS pre-defined parcels?

Modified on Thu, Jul 15, 2021 at 5:48 PM

Predefined Package Name	Dimensions	Weight
Card	Min: 3 ½" x 5 ½" Max: 4 ¼" x 6"	Must be a flat surface
Letter	Min: 3 ½" x 5 ½" Max: 6 ⅛" x 11 ½"	Maximum weight is 3.5 oz.
Flat	Min: 6 ⅛" x 11 ½" Max: 12" x 15"	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]	Rolls and tubes up to 26" long. This predefined parcel includes unwrapped, paper-wrapped, or sleeve-wrapped articles that are not letter-size or flat-size (e.g., catalogs, directories). Articles enclosed in envelopes that are not letter-size, flat-size, or machinable parcels.	Contents must weigh less than 16 oz.
FlatRateEnvelope	12 ½" x 9 ½"	Contents must weigh less than 70 lbs. International Weight limit: 4 lbs.
FlatRateLegalEnvelope	15" x 9 ½"	Contents must weigh less than 70 lbs. International Weight limit: 4 lbs.
FlatRatePaddedEnvelope	12 ½" x 9 ½"	Contents must weigh less than 70 lbs. International Weight limit: 4 lbs.
FlatRateGiftCardEnvelope	10" x 7"	Contents must weigh less than 70 lbs. International Weight limit: 4 lbs.
FlatRateWindowEnvelope	10" x 5"	Contents must weigh less than 70 lbs. International Weight limit: 4 lbs.
FlatRateCardboardEnvelope	12 ½" x 9 ½"	Contents must weigh less than 70 lbs. International Weight limit: 4 lbs.
SmallFlatRateEnvelope	12 ½" x 9 ½"	Contents must weigh less than 70 lbs. International Weight limit: 4 lbs.
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]	Option 1: 10 ⅛" x 7 ⅛" x 5" Option 2: 16 ⅙" x 11 ⅙" x 2 ½"	Contents must weigh less than 15 lbs.
RegionalRateBoxB ^[1]	Option 1: 12 ¼" x 10 ½" x 5 ½" Option 2: 16 ¼" x 14 ½" x 3"	Contents must weigh less than 20 lbs.
LargeFlatRateBoardGameBox	23-11/16" x 11 ¾" x 3" – Inside 24-1/16" x 11 ⅞" x 3 ⅛" – Outside	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.