We take gallon and quart size. When we go to the pool we have a collapsable cooler and we put ice in the zip lock in the cooler, keeps cooler dry and its easy to change, reload and go out again. I also keep a few drinks in cooler in room on ice to be real cold and the rest in the fridge. Packing, we got into the space bags. Thought they were a jole until I tried them one trip. We'll now me and the wife have them, no vacuum needed, place clothes in and roll air out one way valve at rear. First time I used them, I have a check list on what I pack and it varies very little, I put my stuff in the travel space bags and had only half of my suitcase filled. Scared I forgot alot of stuff but it was all there, just the air was missing, that made my wife a believer!!