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  1. A large envelope sent via USPS must meet the following criteria12345:
    • Maximum size: 15" x 12" x 3/4" thick.
    • Maximum weight: 13 ounces.
    • If it exceeds these limits, it will be classified as a package and subject to parcel prices.
    Learn more:
    Typically, large envelopes are sent in an envelope large enough to fit an unfolded 8½â€ł x 11″ sheet of paper. Envelopes used for flat mail cannot be more than ¾â€ł thick, 12″ high, 15″ long or weigh more than 13 ounces. The USPS considers any envelope bigger than this size to be a package, and they will be subject to parcel prices.
    www.stamps.com/usps/large-envelopes/
    The maximum size for large envelopes is 15" x 12" x 3/4" thick. The maximum weight for large envelopes is 13 ounces. A large envelope exceeding 13 ounces is classified as a Priority Mail item.
    about.usps.com/postal-bulletin/2007/html/pb22218/…
    Have one dimension that is greater than 6-1/8 inches high OR 11-½ inches long OR ¼ inch thick. Be no more than 12 inches high x 15 inches long x ¾ inch thick.
    pe.usps.com/BusinessMail101?ViewName=Flats
    For your mail to be considered a large envelope/flat and not a package (parcel), it must not exceed the following criteria: Maximum Size: 15" (L) x 12" (H) x 3/4" (thickness) Maximum Package Weight The maximum weight for large envelopes is 13 ounces.
    help.paypal.shipstation.com/hc/en-us/articles/4411…
    Large Envelopes Maximum thickness 3/4 inch Packages Maximum length plus girth 108 inches (130 inches for USPS Ground Advantage)
    pe.usps.com/text/dmm100/mailing-domestic.htm
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