Hydro Flask 21 oz Insulated Stainless Steel Water Bottle in Mermaid Green is a practical everyday bottle made for reliable hydration at home, work, school, travel, the gym, or outdoor activities. Its 21 oz size is easy to carry while still offering enough capacity for daily use. Built with TempShield double wall vacuum insulation, it keeps drinks cold for up to 24 hours and hot for up to 12 hours. This makes it suitable for ice water, coffee, tea, or other beverages you want to keep at the right temperature throughout the day. The leakproof Flex Cap closes securely to help prevent spills when the bottle is placed in a backpack, gym bag, tote, or car cupholder. The flexible handle makes it easy to grab and carry, whether you are commuting, walking, traveling, or heading outdoors. Its standard mouth opening is comfortable to drink from and easy to refill. The slim, cupholder friendly shape fits easily into most vehicle cupholders, making it convenient for road trips, errands, sports, and everyday routines. Made from durable pro grade stainless steel, this bottle helps preserve a clean, fresh taste with no unwanted flavor transfer from previous drinks. Water stays tasting like water, even after using the bottle for tea, coffee, or other beverages. Dishwasher safe for quick and simple cleaning, the Hydro Flask 21 oz bottle combines strong insulation, leakproof performance, durable construction, and a bright Mermaid Green finish in one reusable design.