Frozen packs for your snacks
We might want to eat something when we are traveling, but the options are usually limited since some snacks need to b refrigerated, which is not possible in the middle of a trip. For things like chocolates, we have a solution to keep them fresh and ready for when hunger shows up.
Frozen sponges. How? You might be thinking, but the trick is simpler than it sounds. You have to buy some sponges and leave them in the freezer the night before the trip. The next day you store them in a plastic bag, and voila, you have a cold pack for your snacks and can refresh yourself if necessary.