Molded out of rugged polypropylene plastic, these comfortably handled ammo cans, will hold up to some pretty harsh treatment. Utilizing MTM's tongue and groove O-Ring seal system for a superior water-resistant seal, the 30 caliber can is designed to fit the same amount of bulk ammo as the originals. A heavy-duty dual latching system makes for a better seal and less likely to open accidentally. Double padlock tabs along with molded-in stacking ridges, make these solid containers the perfect solution to so many storage needs. Weight: 1.38 pounds. (The 30 cal military metal can weighs 3.76 pounds.) Makes an ideal geocaching container due to its color, O-ring seal, and rugged construction.