Not quite sure about the origins of this pack, the colors would suggest to me German military, but the only distinguishable marking printed on the inside of the top flap reads “Decize” which is a town in France. The pack is made of heavy-weight Grey canvas with black leather trimmings and fittings.
The pack itself is very wide at 19 inches across the back, expandable by a few more inches via lace up expansions on the back sides. Two large cargo pockets on the sides and one front pocket all close via leather buckles. A draw string closes the top underneath a double buckle top flap. Finally another long leather belt runs from the top and buckles to the solid leather bottom.
Shoulder straps secure a metal external frame. The straps are adjustable by multiple buckles which create tension on a lower cross strap at the hips which keeps the frame from resting directly on the back. About a half inch of felted wool makes up the shoulder strap padding. One of the straps is breakable, a technique common to military packs allowing troops to slip out of them while in the prone position.