An ice pack having a reservoir, a large mouth, and a narrow neck intermediate the mouth and the reservoir. The mouth is tapered to a form funnel to permit the reservoir to be easily filled. A variance in heat exchange is provided between the opposing sides of the ice pack. Hence, one side is significantly...http://www.google.fr/patents/US5356426?utm_source=gb-gplus-shareBrevet US5356426 - Refillable ice pack
