VERIFIED SOLUTIONi




Explaining different shipping and package sizes

UPDATED: 18 March 2016

For current USPS® information, refer to Mailing Standards of the United States Postal Service - Domestic Mail Manual.

  • Flat Rate Envelope - Best for letters, documents, manuscripts
    Envelope Size is: 12.5” long x 9.5 high”
  • Legal Flat Rate Envelope - Best for legal documents
    Envelope Size is: 15” long x 9.5 high”
  • Padded Flat Rate Envelope - For things like books, clothing boxed jewelry
    Envelope Size is: 12.5” long x 9.5 high”
  • Small Flat Rate Box - For things like brochures, small electronics
    Box is: 8 11/16” x 5 7/16” x 1 ¾”
  • Medium Flat Rate Box - For shipping things like office supplies, shoes, etc.
    Box size is: 11.25” x 8.75” x 6 or 14” x 12” x 3.5”
  • Large Flat Rate Box - Laptop computers, gifts, etc.
    Box size is: 12.25” x 12.25” x 6”
  • Military Large Flat Rate Box - Gifts for troops
    Box size is: 12.25” x 12.25” x 6”
  • Regional Box A - For domestic address only- zone reduced prices, weight limit 15lbs. Box size is 10.125” x 7.125” x 5” top loading or 13 1/16” x 11 1/8” x 2 1/2” side loading
  • Regional Box B - For domestic address only- zone reduced prices, weight limit 20lbs. Box size is 12.25” x 10.5” x 5.5” top loading or 16.25” x 14.5” x 3” side loading

Another helpful resource is Shipping Simplified - latest news and ways to save.