When traveling, some people prefer to go backpacking. The mouthpiece (7) is mounted at the top of one strap (5) for inputting air into the air cushion mounted in the inner space. Most of them are adequately padded and shaped to conform to your shoulder bag strap or travel bag. This way it is possible to manage a fairly large and even heavy load while still leaving the hands free with the load set so that the person carrying it can walk naturally.