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TCW
This is one type of Federal issue Haversack or Breadbag. Usually made of painted cotton or linen to make them waterproof. It had an inner calico bag attached to the inside of the breadbag by three buttons.
Please don't assume that the soldier carried all the above stuff in his Breadbag. The Breadbag carried exactly what it said, bread and rations. Yes, he would have carried plate, KFS and possibly tobacco and pipe in there, but all the other stuff would probably be carried in his knapsack, blanket roll or pockets.
Breadbags soon became distinctly unhealthy, with pork fat, fruit, salt, coffee (or coffee substitute) and tobacco nestling together and jumbling about in all weathers. Not the best place to keep letters from home, writing equipment, housewives etc. I know, I've tried it - you won't believe what can breed in a housewife smeared in pork fat, soap and tobacco!