Adjustable backpack

The utility model discloses an adjustable backpack and relates to the field of backpacks. The bag comprises a bag body, a track, shoulder straps, a fixing module, a sliding module and a film pressing shell, the shoulder straps and the track are installed on the bag body, the sliding module is arranged on the track, the film pressing shell and the sliding module are connected with the shoulder straps, the lower portion of the bag body is connected with the fixing module, and the fixing module can be opened in an overturning mode and fixed through hook-and-loop fasteners; according to the backpack, the backpack body, the track, the fixed part, the movable part, the shoulder straps and the film pressing shell are matched, so that the shoulder straps of the backpack can be adjusted according to the height of a user, and the backpack has the advantages of being ingenious in conception, novel in design, diversified in function, durable, high in practicability, good in comfort, good in fitting degree, wide in applic