A cravat, or triangle bandage, is a basic first aid item that can be used as both a bandage and a sling. NOLS recommends keeping a few of these in a personal first aid kit.
NOLS Wilderness Medicine Pocket Guide
$ 4.99
NOLS Med Kit 4.0
$ 49.99
NOLS Wilderness Medicine 6th Edition
$ 16.95
NOLS Wilderness Medicine Wound Kit