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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.

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