The WANDERER is the strongest, most comfortable, and best insulated cooler-pack ever made.  With over 1.5 inches of insulation, the Wanderer will hold ice for 5 days.  Our NEANDERTHAL waterproof flip lid makes finding what you need easier than ever.  The Wanderer 25 and, its big brother, the Wanderer 45 come complete with a 30oz stainless steel tumbler, a silicone water bottle, and a NEANDERTHAL bottle opener, oh, and a 10 watt all-weather Bluetooth speaker.  This pack has it all; the speaker has a USB port to charge your phone,  that can harness the power of the sun, with a NEANDERTHAL solar-charger.  Both size packs have backpack straps, as well as a shoulder strap, ventilated back padding.    With the Wanderer, listen to music on the go with the coldest cooler bag.