Yes! This is one of the reasons why foil packs are so perfect for camping trips. You can assemble them in advance, put them in a cooler, and take them to wherever you are going. If you’re cooking them at home, foil packs can be kept in the refrigerator for several hours. If you are traveling with your foil packs, double up on the foil or use heavy-duty foil, just to make sure there are no leaks in your cooler.