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I’ve tried the self heating cans, but not the cooling ones yet… “Tempra Technology and Crown Holdings present the first real self-refridgerating can. There’s finally a real, working, practical self-refridgerating can. The Instant Cool Can (I.C. Can) is a 100% safe and environmentally friendly self-refridgerating process that cools using brilliantly simple water evaporation. In fact, it’s proven to lower beverage temperature by a minimum of 30° F (16.7 C) in just three minutes.” [via] – Link.

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Awhile back we dissected a self-heating can – Link.