I'll just throw out another possible option to the toolbag, er, first aid kit. Basically, it's the use of a cling wrap type bandage to apply hands-free pressure. Not just directly on the wound, but also a more generalized compression that slows the blood flow to the area which could be preferable to direct pressure. For example, for a wound with underlying fractures where traditional direct pressure would be excruciating for the injured person. Sort of an alternative to a tourniquet, but less extreme.
Some of you might remember me asking about it in this old post:
ELAD--The other Israeli bandage Does anyone know if this idea ever became commercialized and put into the field? I've never heard it mentioned anywhere else.
It would be quite simple to replicate the general idea of the ELAD. It would be helpful to take a "normal" 12-18" wide cling wrap you can buy at the supermarket and cut in half or even smaller. Narrower would seem to be more convenient for wrapping an arm or head wound than a foot-wide roll. But a foot-wide roll could be handy for other hard-to-compress sites like an abdominal wound.
Cheap, doesn't stretch when soaked with blood like an elastic bandage might, sticks to itself, and being transparent, it allows some degree of checking on the condition of the wrapped area without having to unwrap the bandage.