The beer can shoulder koozie cooler sling backpack provides you with easy access to one chilled beer without having to open the bag. Now you can party it up anywhere you want and have cold beer. Perfect for hunting or fishing. The koozie cooler backpack is an insulated beer sling that keeps your 6-pack of beer or soda chilled and cozy. You can just sling it over your shoulder. Your cans are stacked inside its insulated zippered tube.