Bertil drinking bottle is made of the best stainless steel material on the market - 18/8 steel. The bottle has a thermo function, so it keeps the liquids warm for 12 hours or cold for 24 hours. The drinking bottle comes with a regular lid covered with wood on top and an activity lid with perfect and tight drinking function with silicone spout. Both lids have handles and can easily be attached to a bag or stroller. Capacity: 350 ml.