How many stamps for 1.3 lb box?

The number of stamps needed for a 1.3 lb box depends on the postage rate for that weight and the type of service you choose (e.g., First-Class, Priority). As of October 2023, First-Class Mail typically covers up to 13 oz with a single stamp, while a 1.3 lb package would require additional postage, likely needing around 3-4 stamps or equivalent postage. It's best to check the current USPS rates or use their online postage calculator for the most accurate information.