My friends and I are going backpacking and want to keep a single item cold for 2-3 days. Freezing is not a problem - preferably the closest to being frozen as possible. It is medication that may be needed in case of emergencies. It's about the size of a large snickers
Our idea is to buy some kind of snap-cold pack and place our belongings in a small cooler filled with ice water. We only have to carry this stuff for 2 days, max, so the weight won't be too big of an issue.
Are there better was of approaching this? What gel packs have backpackers used?