iSeries 1717-16 Waterproof Utility Case (padded liner) The 3i-1717-16LT is watertight and dustproof, and features a deluxe Nylex-wrapped closed cell fitted foam liner, nylon divider, and (4) Velex-covered foam pads with heavy duty hook-and-loop tabs to create the perfect fit for all kinds of gear. SKB iSeries Injection Molded Mil-Standard Waterproof Cases are molded of ultra high-strength polypropylene copolymer resin, featuring a gasket-sealed, water and dust tight, submersible design (MIL-STD 810G) that is resistant to corrosion and impact damage. Standard features include a molded-in hinge, patented trigger release latches, snap-down rubber over-molded cushion grip handle, automatic ambient pressure equalization valve (MIL-STD-648C), and resistance to UV, solvents, corrosion, fungus and impact damage (MIL-STD 810G).