With a whopping 23 quart capacity, there is plenty of room for food and snacks, a hearty picnic lunch – or more than 24 cans of ice-cold, liquid refreshment. The top opening features a heavy-duty two-way water-repellant zipper that pulls open for full access to the main inner compartment. Next to the main opening, there is a zippered side pocket, an ideal place to put an Engel Cooler Pak or two. (Engel Cooler Paks will keep the adjacent contents in the main section cold without relying upon ice – freeing up more space for groceries and eliminating sloppy meltwater.) In the main compartment, contents are held in a patented, removable liner bag that attaches around the top with hook-and-loop fasteners. The reinforced bag is puncture-resistant and features Microban anti-microbial protection. This exclusive Engel feature protects the inside of the bag and, best of all, makes for easy clean up at the end of the trip.