I use a couple of army ammo cans. Watertight, sealable, humidity control, stackable, etc. A 50 caliber can will hold 7 one pounders, a 800 round 5.56 can will hold 11-12 one pounders, a 40 mm grenade can will hold 20-22 one pounders. Just seek a Army surplus store in your area, they shold have...