The Hybrid Canteen is perfect for those who prefer the hypoallergenic properties of a glass bottle. Stays colder twice as long as glass alone. Triple-insulated stainless steel base unscrews from glass portion, creating a separate drinking vessel. Hypoallergenic glass. Vacuum sealed. Easy-grip flat sides. Non-slip bottom. Screw-on cap. Wide mouth for ice cubes. No bottle sweat. BPA free. Dishwasher-safe glass. 20 oz. capacity.