<human>: Here is a goal: How can I make homemade Ice packs for injuries at home?

Which way makes more sense to accomplish this goal?

OPTIONS:
- Mix 3 parts water and 1 part rubbing alcohol in a paper bag, it will get very cold but won't freeze hard.
- Mix 3 parts water and 1 part rubbing alcohol in a ziploc bag, it will get very cold but won't freeze hard.
<bot>: Mix 3 parts water and 1 part rubbing alcohol in a ziploc bag, it will get very cold but won't freeze hard.