You can make them yourself for free – which not only saves you money but also reduces the amount of potentially toxic chemicals you have in your house. Years ago I discovered that plastic soda bottles work just as well as those hard ice packs do! I just take empty 20oz bottles and fill them 3/4 of the way up with water and put them in the freezer. (You cannot fill them all the way, as the water expands as it freezes) Voila – free ice packs. You can use different sizes depending on what you need to keep cold and how big your cooler is, but it really makes no sense to pay for something that you can make for free at home. Keep that in mind next time you are headed to the park or going camping!