I needed something to carry while I go around events spending all our hard earned money so I made this primitive Appalachian satchel from some old linen and a bark tanned buckskin flap.  I oil clothed the linen with beeswax and linseed oil.  The strap is just a simple half inch strip of oil tanned cowhide and is not adjustable.

Here it is from behind.  I use waxed linen thread on all my bags.  I got the brain tanned buckskin from Curt Lyles.