PURPOSE:To provide the titled ice bag which can be used at any time and at any place without the need of ice water only by applying external force to break an outer bag when necessary, prepared by tightly putting a specified freezing mixture and a solvent-containing bag into an outer bag. CONSTITUTION:A freezing mixture consisting of ammonium nitrate and urea and a solvent selected from among an aqueous solution of a water-soluble polymeric substance (e.g. gelatin or methylcellulose), gel thereof and water, contained in an inner bag made of a synthetic polymer which has such a strength that it may be readily broken by application of external force when the bag is to be used (e.g. nylon or PVA), are tightly put into an outer bag made of a synthetic polymer which stands external force that breaks the inner bag (e.g. nylon or PVC). The inner bag is broken just before use by applicationof external force. The ice bag is portable and is very useful, since coolingis performed at any time and at any place without the need of ice water.
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