Original large 1942 Heeresverpflegung or "army supply" ration sack. This is the twisted paper twine version, harder to find than the fabric ones. Only one side is printed. The markings are clear and un-messed with (many sacks were de-nazified after the war). Decent condition, but it has staining / discoloration.
These were essentially a catch all for rations. One standard bag that could be filled with anything from coffee beans to cans of food or loaves of bread. These were just a convenient way to package large amounts of something for shipping.