What size cooler do I need?
Match the cooler to the trip: a 12-can soft cooler bag suits a lunch or a short walk to the water, a cooler backpack carries a day's food and drinks hands-free, and a ~25-quart hard cooler handles a full day or an overnight for one or two people. As a rule of thumb, plan for roughly a 2:1 ice-to-contents ratio for the longest cold retention.
