This product was tested by 100% filling with ice at an ambient room temperature of 76 degrees F. The cooler was checked for Ice and temperature every 12 hrs. At 36hrs, Ice was still present. NOTE: Results will vary according to the ambient temperature, the volume, and the starting temperature of the contents. Always chill items if possible before filling cooler. Always clean product and dry. | Murdoch's EVR-ICE 30 Can Backpack Cooler in Grey | Size 17" x 10" x 13.5"