You can use an absorption cooler on 12V, 230V, or gas. This makes it useful for at the campsite or on the go, even without a power source. These coolers work silently. You can use them in a camper or caravan, for example. Most models have a 30 to 40L capacity, which is enough for bottles, sandwiches, and snacks. You can place it wherever you want and can barely hear it.