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The Engel formulas are scientifically designed to freeze at specific temperatures and maintain chilled or frozen temperatures for days; outperforming bagged ice and other ice substitute. Engel Cooler and Freezer Paks are non-toxic, non-hazardous, and re-usable for years. . Therefore, Engel packs are a great dry ice alternative for cold shipping as our pack do not require special handling, training or costly haz-mat shipping fees.