Elemental stainless steel Silicone-strap water bottle - 20 oz. Premium quality 20 oz (590 ml) insulated stainless steel elemental bottles are carefully crafted, BPA-free and food safe. Beverages can stay cold or hot for up to 24 hours. Each bottle comes with a built-in strainer for fruit or other suffusions, and a silicone strap to attach the bottle for on-the-go use.