One of the easiest ways to ship bubble mailers is through the United States Postal Service (USPS). All but the lightest and smallest mailers will be considered as packages by the USPS, and you have several mailing classes to choose from for such shipments. These include First Class, Priority, and Media Mail. The best class for you depends on factors such as the item’s weight and what type of item it is.You can find more information on the various USPS mailing classes by checking out their online PDF pamphlet, A Customer’s Guide to Mailing.