Thermos 18 Ounce Stainless Steel Hydration Bottle, Black Thermos vacuum insulation technology for maximum temperature retention; keeps cold for 12 hours Hygienic push button lid with one-handed operation is made with bpa-free eastman tritan copolyester to resist stains and provide durability Durable stainless steel interior and exterior Dishwasher safe Capacity 18 ounce/530ml