| Frios work like a champ. I'm a sailor and a camper and have been using them for years.
A few suggestions:
Don't oversoak them or they are HEAVY and so fat they are difficult to use. (Not enough room inside for your pump or bottles.)
Don't enclose them in a baggie or anywhere with no air circulation. They stay cool by evaporation.
In very hot places, don't put them in the direct sun if you can help it. Keep them on your shady side if sitting in the sun for a long time.
I have four of varying sizes. I wear one on my belt for my pump when in the desert. I carry my insulin in one when traveling. I used to keep my Humalog pens in one pinned to my shorts waistband when sailing,
Mich | 
