Some adventures clamor for beverages to be brought along and the durable, waterproof, and insulated IceMule Pro Cooler is ready-made to answer that call. The large roll-top closure packbag has a highly-durable, waterproof exterior and interior. Wedged in between is PolarLayer Insulation foam which can keep drinks and other contents cold for over 24 hours! An integrated valve allows you to introduce air to the foam interior which increases the insulating capability. That same valve also allows you to release air which makes the unused cooler that much more compact and easy to store. A roll-top closure allows you to adjust internal capacity and safely stows contents. It also combines with the exterior fabric to make the cooler float on water! A ventilated, padded backpanel cushions the load of the cooler against your bag and padded shoulder straps make it easy and comfortable to carry. An adjustable sternum strap further enables you to dial in fit. A bungee-cord attachment system lets you lash gear to the exterior of the cooler. The IceMule Pro Cooler is available in your choice of color options and 23L, 33L, and 40L sizes.