First, they look downright cool, you can stack them high and they are a great complement to any ammo stockpile or gun collection. Second, they are a great way to organize, transport, and easily stack multiple ammo cans. Third, when individual ammunition cans are stacked on top of one another, the rubber seal in the lid of the ammo can bears the weight of all items stacked upon it, causing the seal to distort and fail over time.  The ammo crate is engineered to be a value added component of the military’s ammunition packaging system, and is vital to meeting the military’s 10-year un-sheltered ammunition storage requirement for its ammunition packaging.