i have a problem that this would solve with things like grenades when there are several weapons that you need and only have 1 or 2 extra slots. so if you want you could have an assault rifle, rocket launcher, parachute, sniper rifle and five HE-Grenades. without this you would have to sacrifice another weapon if you wanted multiple grenades. however i do think a limit is a good idea or people would be running around with a nearly infinite number of things which would defeat the point of a single-use item.