- Learn more:âś•This summary was generated using AI based on multiple online sources. To view the original source information, use the "Learn more" links.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=FlatsFor 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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