flexiblewhen frozen? Cut for custom fit around items for localizedintense cold? Sheet size: 19? x 15.5?CUBESCASE PACK: 24GEL PACK? Uses non-toxic Ultratherm® gel for extendedcooling performanceEach reusable pouch contains 8 oz (236 ml)of freezable gel. Soft pouch molds to fit around items forlocalized intense cold.