no matter how large the backpack is, it is too small for too many things to pack when going in nature for some survival kind of trekking. This bandana will help, a least a little. First, it will help you with Survival information, which includes: Navigation, Fire Starting, Shelter, Water Collection & Purification, Signaling, a useful Knots section, and a section for Priorities considerations. Second, you can use it for splinting, slinging, Pressure Bandage, Tourniquet (with proper training), Head Bandage, Dust Mask, and many more. Third, it is useful for signaling due to bright colors, use it as water collection, shading and so on. Also, you can even use it in extreme cases for …well, you know what… if you run out of toilet paper. Just don’t put it back after that!