I use these large size rubber bands to keep my folders intact. When I finish a project I'm working on even though I use fasteners (ACCO) to keep my papers in place I like to put a rubber band around the folder just in case there are loose items in it. They are very strong & I never had one break yet.
Love the size and what they accomplish but....they need to be made stronger and better material. Maybe not in rubber for durability. They break easily.