The Hydro Flask 24 oz is one of the largest versions available. It is designed with professional-grade stainless steel and TempShieldT double wall insulation which keeps the water refreshingly ice cold for up to 24 hours. Additionally the insulation helps in resisting condensation. It is BPA-Free and Phthalate-Free and comes with a lifetime warranty. It can be paired with Hydro Flask's Sport Cap for one-handed refreshment.