What is the weight limit for first class mail?
What is the weight limit for first class mail? Maximum weight for First-Class Mail letters is 3.5 oz; for large First-Class Mail envelopes, the maximum weight is 13 oz. All postcards and envelopes (or flats) must be rectangular, otherwise an additional charge may apply. Additional size restrictions apply depending on the type of mailpiece you're sending.
Can I ship a 14 oz package first class?
USPS First Class Package Service allows you to ship lightweight packages that weigh up to 15.999 ounces. As for dimensions, a First Class Package can have a maximum combined length and girth of 108 inches.
Can I use old first class stamps?
As mentioned above, postal stamps do not expire and can be used indefinitely. In the event of a price increase, customers can purchase Denomination Stamps to make up the price for postage or use Forever Stamps. Can I purchase 1-cent or 3-cent stamps to makeup the increase in postage? Yes.