Hydro Flask Hydration, 16 oz (473 ml), Wide Mouth, Lupine

This portable 16oz bottle from Hydro Flask, a brand that's explosively popular in Hawaii, keeps drinks hot or cold for up to 24 hours and hot drinks for up to 6 hours. It also has a flavor transfer prevention function, helping to keep your drinks delicious. It's made from durable, rust-resistant 18/8 stainless steel, the same material used for tableware.