Predefined Package NameDimensionsWeight
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.
ParcelMaximum 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.
FlatRateEnvelope12 ½" x 9 ½"
  • Contents must weigh less than 70 lbs.
  • International Weight limit: 4 lbs.
FlatRateLegalEnvelope15" x 9 ½"
  • Contents must weigh less than 70 lbs.
  • International Weight limit: 4 lbs.
FlatRatePaddedEnvelope12 ½" x 9 ½"
  • Contents must weigh less than 70 lbs.
  • International Weight limit: 4 lbs.
FlatRateGiftCardEnvelope10" x 7"
  • Contents must weigh less than 70 lbs.
  • International Weight limit: 4 lbs.
FlatRateWindowEnvelope10" x 5"
  • Contents must weigh less than 70 lbs.
  • International Weight limit: 4 lbs.
FlatRateCardboardEnvelope12 ½" x 9 ½"
  • Contents must weigh less than 70 lbs.
  • International Weight limit: 4 lbs.
SmallFlatRateEnvelope12 ½" x 9 ½"
  • Contents must weigh less than 70 lbs.
  • International Weight limit: 4 lbs.
SmallFlatRateBox8 ⅝" x 5 ⅜" x 1 ⅝"Contents must weigh less than 70 lbs.
MediumFlatRateBox11" x 8 ½" x 5 ½"Contents must weigh less than 70 lbs.
LargeFlatRateBox12" 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.