Thermos Intak Kids Color Change Hydration Bottle, School Daze Kids color changing hydration bottle is BPA free: single wall stainless steel body and polypropylene top To activate color change, just add ice water Fuel style top is easy to use and carry; wide mouth is large enough to fit ice cubes Intended for use with cold, non-carbonated beverages 24-Ounce capacity, dishwasher safe in the top rack or hand wash