The Zarges Y Series transport cases are based of the K470 series, yet with added protection to meet additional military specifications. Each model is registered with a NATO supply number. These rugged aluminum cases provide additional waterproof and environmental protection for military, industrial and commercial applications. Not only are all joints welded, but all seams are sealed with silicon to make the case waterproof up to the lower edges of the handle. All container sizes can be stacked inside each other.