TRANSFERABLE BACKPACK IN A VENTRAL POSITION FOR SITTING WITHOUT A GENE ON A FOLDER SEAT OR ACCESSING THE CONTENT OF THE BAG OR SECURING IT IN PUBLIC TRANSPORT AND IN THE CROWD

摘要

Lengthening devices for backpack shoulder straps with or without a belt making it easier to transfer the bag to a central position by forcing it to stay close to the body to sit. And the opposite way: put it back easily in the back position.