No rust, stainless steel hinged lid is recessed to accommodate 1 L water bottles and stays open at 90° to allow uninterrupted access. Lid opens a full 180° to access interior compartment inside the lid to hold items like medicine, keys, napkins, utensils, etc. Shoulder strap holds lid in place while carrying and easily converts to a handle. Lock hasp fits #1 Master Lock® or equivalent (not included). Keeps cool up to 30 hours. Industrial exterior body design supports seating capacity of up to 300 lbs.