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- Size Standards for Domestic Mail:
-
- Minimum Size: Pieces that do not meet the following requirements are
- prohibited from the mails:
-
- a. All pieces must be at least .007 inch thick, and
- b. All pieces (except keys & identification devices) that are
- 1/4" or less in thickness must be:
- 1. Rectangular in shape,
- 2. At least 3 1/2" high, and
- 3. At least 5" long.
-
- Note: Pieces greater than 1/4" thick can be mailed even if they
- measure less than 3 1/2" x 5".
-
- Nonstandard Mail: First-Class Mail, except Presort First-Class and
- carrier route First-Class, weighing one ounce or less, and all sigle-
- piece rate third-class mail weighing one ounce or less is nonstandard
- (and subject to a $0.10 surcharge in addition to the applicable
- postage and fees) if:
-
- 1. Any of the following dimensions are exceeded: Length-11 1/2",
- Height-6 1/8", Thickness-1/4", or
- 2. The length divided by the height is not between 1.3 and 2.5
- inclusive.
-
- The nonstandard surcharge for Presort First-Class and carrier route
- First-Class is $0.05.
-
-
- Source:United States Postal Service; Notice 59, Jan. 1991.