Arms, legs, hands, feet are all body parts that are commonly injured in a crash. The RATS is designed to be applied by the injured person if necessary so it can be done effectively with one hand. There is also the venerable SWAT-T (Stretch, Wrap, And Tuck Tourniquet), which has been used by law enforcement and personal protection agents for decades. It's light, cheap, and can be just as effective with practice. At under $20 these are likely the best bang for the buck of all the products in this article.