Built with YETI's popular ice-for-days, tough-as-nails soft cooler engineering, the Hopper M12 Backpack allows for hands-free hauling of refreshments to the jobsite, trail or campsite. The waterproof, high-density fabric exterior resists mildew, punctures and UV rays, while thick foam insulation delivers impressive cold-holding capabilities. The Magshield closure uses a strip of super-strong magnets to create an ultra leak-resistant shield that stays open when you need it and seals closed with a gentle push. Dual quick-release buckles ensure that the bag can withstand being tossed into your boat or truck without accidentally popping open.