I went to an army/navy and bought some sort of eastern european kidney shaped canteen. They are made of aluminum and have a cork stopper. Then I soaked some rawhide in water, stretched it and sewed it around the canteen. When it dried, it shrunk up tight to the canteen. Then I rubbed the whole thing down with a 50/50 mixture of neetsfoot oil and beeswax. Then i wove a strap out of jute. It came out looking pretty good if I do say so myself.