However, keep in mind that it is not necessary to spend extra money on a cooler that keeps ice for 7 days if you are only going to be camping for 3 days.
Most coolers these days do a pretty decent job of keeping ice. You will see lots of coolers that will cost extra due to how long they are able to keep ice frozen. However, keep in mind that it is not necessary to spend extra money on a cooler that keeps ice for 7 days if you are only going to be camping for 3 days.  This is the cooler that we use. We have been impressed with how long it keep the ice, as well as its durability. It is a good size for the two of us for multi-day trips, but feel free to go bigger or smaller as needed.