Backpacks with a rigid frame

Rigid frame

— an additional stiffening element, usually in the form of one or more solid plates (made of metal, plastic or fibreglass), built into the back. Such plates can be made removable. Anyway, the frame provides additional convenience and safety when carrying loads: individual objects inside do not rest against the user's back through a soft wall, but press on the plates, which evenly distribute this pressure over the entire back.