I bought this backpack at an auction in a box lot. I have no idea what the age of it is. By the way it is constructed and the fact that all the hardware is metal riveted and what appears to be iron d-rings and brass on the ends of the straps that is is WWII vintage. There are no markings of any kind on it. I leave it up to the buyer to determine the age and what/where it's intended use was. Measurements: Length-(Flap open 19-1/2") flap closed 16", width 12" . This is a simple 'pocket' style backpack so the depth would be dependent on how and what it was stuffed with. There are no seams on the sides. I do not accept returns. I accept PayPal only.