Large Mailpieces, Envelopes, & Small Packages They are charged a nonmachinable surcharge even if they weigh less than 1 oz. Unusually shaped mail, like square or vertical envelopes, lumpy envelopes, rigid envelopes, and mail with clasps, string, or buttons, must be hand-canceled. Additional size restrictions apply depending on the type of mailpiece you're sending.Īdditional Charges for Irregular Mailpieces, Envelopes, & Small Packages Nonmachinable Envelopes
All postcards and envelopes (or flats) must be rectangular, otherwise an additional charge may apply. Maximum weight for First-Class Mail letters is 3.5 oz for large First-Class Mail envelopes and parcels, the maximum weight is 13 oz. Large envelopes (flats) start at $1.26. Oversized postcards need letter stamps, which start at $0.63. 
Standard-sized, rectangular postcard stamps start at $0.48. Square, oversized, or unusually shaped envelope stamps start at $1.03. Standard-sized, rectangular envelope stamps start at $0.63. Standard Letter & Postcard Sizes See Insurance & Extra Services Letters One price for up to 3.5 ounces with commercially priced letters and cards. Eligible for delivery confirmation services such as Certified Mail ®. Insurance for loss or damage up to $5,000 for merchandise only. Best priced service for items up to 13 oz. Small packages delivered in 2–5 business days.
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