Comment Frio Cooling Wallet/Pouch (Score 1) 165
When I'm traveling, camping, rafting, etc. I need to bring a supply of insulin pens and keep them cool. I've been using Frio Cooling Wallets for years and they do a good job of keeping my insulin within the acceptable temperature range, even under less than ideal circumstances.
They are basically an inner pouch with a gel quilted into it and an outer pouch. You soak the inner pouch in water and evaporation keeps the pouches contents cool. The cooling effect lasts for days and you can reuse them over and over. Since you don't want to stick a MP3 player in a damp pouch you'd want to put your gear in a plastic bag first. You might have to get creative with something as large as a tablet though since the largest wallet is about 8.5"x6.5" but they also make other items with the same cooling gel but wrap around your head and wrists so there are options if you use your imagination...
http://www.amazon.com/FRIO-Insulin-Cooling-Wallet-Extra/dp/B0002262IA/ref=sr_1_6?ie=UTF8&qid=1346475461&sr=8-6&keywords=frio