SPECIAL PRICE... Retails for 40 dollars! New style upgraded with wider shoulder straps, wicking mesh to keep back extra dry, breathable foam pads, and extra-secure bite valve mouthpiece. Designed to maximize the temperature retention of either hot or cold beverages with a breathable and tear-resistant outer sheath to thermally insulate and prove a barrier next to the pilots body. The insulation is so effective, you can expect 4 hours of sustained liquid temperature control. Insulated pack fits on your back, outside of your harness, or can be stored in your harness. Will hold 70 oz of fluid.