I am all for helping someone it trouble, but if I played with the same group a lot, and the same people were always underequipped and wanting to use my stuff, I would come to the conclusion that they were using me ("I won't worry about buying one of those, OBG will let me use his again"). If we are talking about a built in air compressor I might have in my jeep or something that is one thing, but smaller, less expensive, must have stuff (eating gear, compass, knife, first aid kit {ala Jon Dorn of Backpacker Magazine}), after the second time we would be having a talk. If I can bring two of something, they can sure bring one...