There's nothing more versatile in a first aid kit than an elastic bandage. It helps reduce swelling and pain from a sprain, or to immobilize a splint after a broken bone or severe sprain. It's a good idea to keep a few extra rolls in your gym bag or car glove box.
The non-woven triangle bandage is a cost-effective, lightweight, disposable, disposable bandage. Also available for filling and securing, but designed for single use. You can also fold the bandage points to longer lengths to make wide folded bandages for splints.