Here is a project I have been working on... A converted OMS canister for use as a canister light battery pack. For about 1/2 the price of Delrin, you can't beat this option. It will fit up to 10 18650 LiIon batteries in there. Modifications include- adding second o-ring to lid, adding switch/boot, switch guard, gland and lid cover. The plan is to mate these with custom built maglite heads for a truly affordable canister light. I'm talking the same amount of light as the big boys for 1/2 price or better! And no, the Mag heads won't be all hacked up, they will be custom machined to fit whatever LED/reflector combo used with custom cut glass lenses, bigger o-rings, etc...