there was a gal offering to build custom bags in the yard sale, maybe a year ago?
something with/about posters (poster tubes) in her user name.
Me, I use an assortment of bags from the new folding camping furniture.
I won one of those folding metal/canvas chairs at a company picinic, my first thought "oooh, this'll make a nice stand bag".
You can probably buy one of those chairs w/the bag at wally world for less than a "stand bag". The shoulder strap is handy...