A medium-sized cooler keeps food and drinks cool during a weekend away, a day at the beach, or a long car ride. These coolers mostly have a capacity between 25 and 40L. That's enough for multiple bottles, sandwiches, and snacks. You can choose from models that work on the power grid, 12V, or with cooling elements. With a medium-sized cooler, you have everything you need without it needing much space.