Combat Daddy Equipment is made with 600x600 Denier polyester, 7.85 oz. per square yard total weight, 1.25 oz. polyurethane back coating, and durable water repellent finish, this quality is 100% military grade polyester. Our product was designed from a collective of members from Army Special Forces, Navy SEALs, Navy Explosive Ordinance Disposal, and Air Force Pararescue operators. the MK2 (Mark Two), is similar to a Combat Medic's backpack and a EOD's backpack, this allowed for the maximum use of the space and function for different types of mission. We have incorporated these same principals into our bag. Removable Logo Patch Large internal expandible cooler MOLLE (Modular Lightweight Load-carrying Equipment) Straps added to the Back Color: Desert Khaki with Navy Working Uniform (NWU) Trim