Polar Tech's leakproof Ice Brix are the industry's original, and truly leakproof gel pack. Each Ice Brix is made with nontoxic biodegradable gel and is listed as FDA GRAS. The gel is sealed in a heavy duty poly bag and provides exceptional temperature control and protection. Don't worry about gel destroying labels, boxes, or the perception of toxic gels leeching into your products. The Ice Brix brand is globally rated "Best in All Aspects".