goodtimes
Expedition Poseur
For day trips, we put the cold stuff (water, beer, etc) in ice at the bottom of a small cooler, fold up a towel to cover that, then just put the dry stuff (typically in zip lock bags or plastic containers) on top of the towel. The towel is thick enough when folded to provide plenty of insulation to keep the moisture in the sandwiches from condensing & turning the bread soggy, etc.