The Hydro Flask Standard Mouth 621 ml water bottle is designed for everyday hydration at home, work and on the go. Made from durable stainless steel, it features TempShield® double-wall vacuum insulation to keep drinks cold for up to 24 hours and hot for up to 12 hours. The slim design fits most cup holders, making it easy to carry wherever the day takes you. Leakproof when closed and dishwasher safe for easy cleaning, it offers reliable performance and everyday convenience. Not suitable for microwave use.