U.S. Army issue, WWI gas mask and satchel bag. I'm not sure but I think this could be a C.E. Mask respirator with late war satchel. The respirator is affixed to a yellow type ‘H’ filter canister. The filter canister is marked 161 X H and I think this one protects against both smoke and gas, attached to the filter canister is an instruction, record book which also includes a field repair kit. Unfortunately the anti fogging compound is missing. The interior of the "CEM" mask has a rubber padded nose-clip and the rubber mouth piece for breathing, which is in fair condition for it's age. I can't make out any of the markings on the satchel bag, except for No.3 - Wide on the front flap and to the left corner of this there seams to be a square with something written in it and 379714X on the inside lap as well. Below this number could be an ??18, maybe the year? The "CEM" mask has the markings 3 wide 137T and 60 on the front where the forehead would be. I have no idea what these numbers mean. On the front of the satchel bag is the name of the digger "Alex Olson". I couldn't find any details of this brave person. I believe there’s not too many of these around in this condition. overall I think it's a neat piece of history and at the same time to remind us what these brave diggers went through.