Hydro Flask Insulated Stainless Steel Coffee/Tea/Water Bottle, Wide Mouth with Hydro Flip Lid, 18-Ounce Acai Purple Double wall vacuum insulated stainless steel water bottle keeps drinks cold for up to 24 hours and hot for up to 12 hours Premium grade 18/8 Stainless Steel BPA free Sports Bottle High quality colorful powder-coated matte finish exterior that never sweats A great way to give back Hydro Flask donates 5% back to a charity of your choice The Lifetime Warranty makes Hydro Flasks the best water bottles