RTIC Ultra-Light Construction makes this cooler up to 30% lighter than wheeled rotomolded coolers of similar capacities. Up to 2.5 inches of Closed Cell Foam Insulation locks in the cold for up to 5 days. Rapid V-Drain System (Dual Drain Holes) for easy, hands-free draining. Marine-Grade Rope Handles feature durable hand grips for easy carrying and lifting of the cooler Molded Tie Down Slots can be used to attach the cooler to a boat, trailer, or truck bed. Non-Skid Rubber Feet keep the cooler in place even on smooth or slippery surfaces. Integrated Lock Holes allow the cooler to be secured shut with personal locks. The lock size for our coolers is a long shank lock with a 5/8"" shackle.