How's about making an ammo box. I know, been done.
This one would be different. It would be assignable as cargo. Only it would be invisible in any seat. As cargo you could then use somebody's script to jettison it from a plane and then have it parachute down as an ammo or supply drop. I know I could certainly do with something like that.
There could be different sized ones, maybe a medic one which you could heal yourself at.
What do you guys think?