Original issued large-type Swiss Military backpack. These large-type backpacks were typically issued to either medics or radio operators. Backpack has one large main compartment only.
The main compartment has a large outer flap that is secured with two adjustable belts on the left and right corners and one large adjustable belt which runs vertically on top of the which is covered by two inner flaps that feature two belts to secure them, underneath the main front flap.
There are a few patches of fur worn away on the front flap. On the canvas of the inner flap is some black resin staining. Cowhide is worn on the rear panel of the backpack where the pack would have rubbed against the soldier's back.
Photos depict actual item for sale.