My cousin bought this at an auction in Southern Illinois. She assumes it is Native American, but some have suggested African origin. There are some pictures (not great quality I’m afraid) here: http://www.bozpc.com/house/
It is about 24 inches across at the top. The bottom is partially collapsed.
Looks like I should have come up with a sexier title!
Assuming anyone is still interested, I probably should have described it as rawhide, rather than leather.