The Pelican 1560M Case is an airtight, crushproof, dust and water resistant hard case for use in rugged terrain. It includes a mobility kit which adds a retractable extension handle and a built-in dolly system with 4"" polyurethane wheels and stainless steel ball bearings. You can travel knowing that your gear inside this case is protected thanks to its solid polypropylene walls and watertight polymer o-ring seal. An automatic purge valve allows you to open the case after changes in atmospheric pressure at any altitude, making it suitable for air travel. The double-throw latches on the side of the case can withstand almost 440 lb of pressure, yet allow you to open and close the case with a light push or pull. The Pick N Pluck foam inside the case allows you to custom fit your gear into the large compartment of the case. Stainless steel hardware and padlock protectors prevent corrosion while providing extra strength against theft..