Sizes for Domestic Mail
Mail must meet these standards:
- Thickness—No less than 0.007 in. thick. Pieces that are 1/4 in. thick or less must be at least 31/2 in. high, 5 in. long, and rectangular in shape.
- Combined length and girth—No more than 108 in.
- Weight—No more than 70 lbs.
Postcards must be:
- Minimum 31/2 in. high, 5 in. long by .007 in. thick.
- Maximum 41/4 in. high, 6 in. long by .016 in. thick.