Ammo cans are perfect for storing and transporting ammunition. This ammo can features mil-spec seals and is tested by the manufacturer to ensure that it is water and air tight. We conducted our own tests and found the ammo can to be completely dry inside even after being submerged in water for 48 hours. It also survived a 20 ft. drop, and being run over by a four ton pickup truck with no damage to the body or lid. The can will easily hold 500 rounds of .223/5.56 NATO in boxes, or 1100 loose rounds of 9mm, or 2500 loose rounds of .22LR.
When considering how to protect your ammo stockpile investment, an ammo can is accepted by the U.S. military as the most reliable way to protect ammunition from exposure to moisture and humidity. When trying to preserve the life of ammunition, in addition to storing in an ammo can, it is best to keep your ammo in a cool, dry environment with stable temperatures.