
Heirloom and antique (pre-1898) firearms (must be unloaded). You may be asked to open the package at the time of mailing to verify that the gun is unloaded. Ammunition cannot be shipped through the mail.) Non-concealable firearms such as rifles (Must be unloaded, and the package cannot have any markings indicating contents.
Paint (cannot be shipped airmail or internationally). Rubbing alcohol, witch hazel or acetone (cannot be shipped airmail or internationally). Compressed Air or nitrogen (cannot be shipped internationally). Spray Paint (cannot be shipped airmail or internationally). Propane or camp-stove-fuel in pressurized cans or tanks (cannot be shipped airmail or internationally). Aerosol cans (cannot be shipped airmail or internationally). Many of the items below are allowed in limited quantites, and only under conditions that minimize risk to Postal employees, property, or the public: By selecting this option the software will add the USPS Oversized Package Surcharge and will only allow you to select Parcel Select. Oversize Packages: Includes anything greater than 108", when measuring the distance of the longest side, plus twice the width and twice the height. The software may prompt you to enter package dimensions for the Dimensional Weight Pricing. Large Packages: Includes anything from 84" - 108", when measuring the distance of the longest side, plus twice the width and twice the height.
The software may prompt you to enter package dimensions for Dimensional Weight Pricing. Packages: Includes anything up to 84", when measuring the distance of the longest side, plus twice the width and twice the height.Since a Thick Envelope is under 1 cubic foot, the software does not add any USPS surcharges or ask for package dimensions. Thick Envelopes: Includes bubble-mailers and other large, padded envelopes and mailers and has the same size restrictions as a flat.For US destinations, the size requirements differ based on the package type that you select: Packages can weigh as much as 70 pounds, size and weight limits for international shipments will vary by country and mail class.