usps maximum package size international
Packages (small packets) other than rolls must be within the following dimensions: 1  Maximum length: 24 inches. 2  Maximum length, height, and depth (thickness) combined: 36 inches. 3  Minimum size: Large enough to accommodate the postage, address, customs form, and other required elements on the address side.ackages (small packets) other than rolls must be within the following dimensions: 1  Maximum length: 24 inches. 2  Maximum length, height, and depth (thickness) combined: 36 inches. 3  Minimum size: Large enough to accommodate the postage, address, customs form, and other required elements on the address side.