MTM Products AC30T40: MTM\'s 30 Caliber Ammo Can, in short or tall model, is molded out of rugged polypropylene plastic, and this comfortably handled ammo can will hold up to some pretty harsh treatment. Lighter weight than a military surplus can, both the tall and short design offer the same capacity as a traditional 30 caliber military ammo can and will not rust. A heavy-duty dual latching system makes for a better seal that is less likely to open accidentally while the tongue and groove O-Ring seal system make it water-resistant. Heavy duty padlock tabs along with molded-in stacking ridges make these containers the perfect solution to so many storage needs.