Cooler exclusively for Hyotenka Pack! (General cold packs can also be used) ● With Hyotenka Pack, you can! Keep ice cream frozen for up to 13 hours! ● Ultra-thin and compact storage ● Protects bottles from external impact Shell protect structure ● Achieved with a new insulation material! ● Holds 16 x 350ml cans or 12 x 500ml PET bottles and a Hyotenka Pack. Stored at home.