I have always travelled with a sarong. This has been worn mainly as a scarf to protect from the sun and to wear in conservative countries. However it has also often been a towel, mat, skirt, pillowcase, seat cover and sunshade. Hanging it over windows blocking the sun on long bus journeys has made some very long journeys significantly more comfortable. It could easily be used to help tie splinted legs or as a triangular bandage. I had a beautiful silk one from Thailand for many years, then a floaty one from Namibia and now a cotton one from exotic Oslo Airport.