With a slim, lightweight design, this 21 oz water bottle from Hydro Flask features double-walled TempShield insulation that keeps beverages cold for up to 24 hours and hot for up to 12 hours. Screw-top insulated sport cap lid features loop for easy toting, and slim build slips right into most cupholders and bags. Powder-coated 18/8 professional-grade stainless steel provides a durable design and clean taste, every time. Free of BPA and phthalates. Content + Care. Stainless steel Food safe Dishwasher safe Not microwave or oven safe Imported Size. 21 oz