These tubes are turning out to be the perfect solution to banner storage. Not your typical use for these but I do like the solid construction firm end-cap fitting and only one had any minor defects that I can definitely live with. The only problem I wish had a better solution was locking ability on the end caps. I'm resorting to the old standard of stapling the ends shut but staplers able to do the job are hard to come by. Overall they are exactly as advertised and sturdy enough for a variety of uses. I also have art and architecture background and would be very comfortable transporting my work in these.