Bag i.e. backpack for transporting loads during e.g. sport activity, has bottom part released from body of backpack by operating zipper for hanging and allowing downward deployment of bellow under action of load

摘要

The backpack has a body made of textile material and defining a load capacity volume (V). A bottom part is connected by one end (2a) with a rear part of the body, where the bottom part is fixed temporarily to the body by a zipper (3). A bellow (4) defining an enclosed additional capacity volume (V1) is secured on an inner circumference of the backpack in a lower part. The bottom part is released from the body by operating the zipper for hanging and allowing downward deployment of the bellow under the action of a load by creating the additional load capacity volume.