iSeries 2421-7 Case w/Think Tank Designed Liner The 3i-2421-7LT is watertight and dustproof, and features a deluxe Nylex-wrapped closed cell fitted foam liner and Velex-covered foam pads with heavy duty hook-and-loop tabs to create the perfect fit for all kinds of gear. Built-in wheels and a pull handle provide convenient transportability. All SKB iSeries Injected Molded Mil-Standard Waterproof Cases are molded of ultra high-strength polypropylene copolymer resin, and feature a gasket sealed, water and dust tight submersible design (MIL-C-4150J). This case features a molded-in hinge, patented trigger release latch system, comfortable, snap-down rubber over-molded cushion grip handle and a automatic ambient pressure equalization valve (MIL-STD-648C). Our iSeries line is resistant to UV, solvents, corrosion, fungus and impact damage (MIL-STD-810G), and comes standard with an Unconditional Lifetime Warranty.