Always interested in what others carry in their kits and always adding and improving my own. For a long time now I've been carrying an item in my kit that I rarely see others list. It is a small container of mineral oil. This stuff is so versatile IMO it should be in any and all kits. Easily obtained at any drug store this substance can be used for everything from a laxative to a way to lubricate and protect you knives, to lubing your firearms. I use it for all that, and as a fire-starter and fuel. Instead of carrying Vaseline impregnated cotton balls (thereby making the cotton balls useless for anything else) I carry cotton balls and use the mineral oil on it. (I show it in a video poster below). This works with cattail duff as well. It can be used as lamp oil as well. Great stuff!