Are you ready for a few days of adventure? With the Ultra Passive Cooler, you can create the perfect cooling system with just ice, ice or dry ice Cools inside for up to 12 days. Perfect for transporting freshly caught fish, barbecue meat, or chilled beer. A cooler box with a thick 1.6 inches (4 cm) or more insulated walls for excellent cold retention. The top of the lid is sturdy and non-slip, making it perfect for sitting. The lid has a groove in the middle of the top and bottom to make it easy to fasten to the car carrier or bed. The drain hole is convenient for draining and cleaning. It can extend the cooling time slightly by draining water from melted ice during use. ● Rubber open and close latch that can be operated even with wet hands. With reinforced locking plate, you can protect food from wild animals by using commercially available U-locks. The bottom is equipped with anti-slip rubber. Designed to prevent movement even in slopes.