Specifications: Material: 18/8 stainless steel. Volume: 20 oz (600 ml)/34 oz (1000 ml) Dimension: 20 oz: 2.8(D) x 10.8(H)inches 34 oz: 3.3(D) x 13.38(H)inches Weight: 0.79lb Thermal insulation effect: Keep cold for 24 hours and hot for 6-10 hours Features: --Made of high-quality stainless steel double-layer vacuum structure, without BPA, which is sturdy and durable, eco friendly and thermal insulation. --Food-grade stainless steel inner tank, the outer wall of the inner tank is equipped with a heat insulation layer and a vacuum temperature lock layer to enhance the effect of cold and heat preservation. --Wide mouth straw lid with dust-proof cap, foldable designed, clean and hygienic, easier to drink water; polyethylene straw, safe and non-toxic, high temperature resistance and no deformation. --With wide loop handle, makes it easier to carry around anywhere, like School, Gym, Office, Swimming pool, Beach, Yoga studio, Dance room and so on. Portable and suitable for all activities, Running, Swimming, Hiking, Skiing, Yoga, Cycling, Camping.