First-Class Mail® prices are based on size, shape, and weight.
Best priced service for mail up to 13 oz
Delivery in 1 to 5 business days
Size & Weight Requirements
Unusually shaped mail, like square or vertical envelopes, lumpy envelopes, rigid envelopes, and mail with clasps, string, buttons, must be hand-cancelled. They are charged a non-machinable surcharge even if they weigh less than 1 oz.
If a mail piece exceeds the maximum length or height or thickness, it will be charged at the next higher price or mail piece category.
Large Envelopes (flats) that exceed maximum dimensions, are rigid, non-rectangular, or not uniformly thick are rigid, are charged parcel prices
This is a live shipping method, the price will be calculated via the web services provided by the carrier.