The AO 18-Pack Backpack Cooler was built for adventure. Not only is it a cooler, but it’s also a backpack! Take it on a road trip, out boating, fly fishing, off-roading, or for any travel to keep your drinks and snacks cold all day. It is insulated with ¾-inch thick, high density closed cell foam and lined with a leakproof, eco-friendly, welded TPU liner. It will not to leak or sweat, and can hold ice for up to 24 hours in 120-degree heat. It comes with a removable shoulder strap and a dry exterior pocket.