Hydro Flask 21 oz Standard Mouth with Flex Straw Cap is a practical and durable drinks bottle designed for easy hydration throughout the day. The bottle holds 621 ml and is fitted with a leakproof straw cap that opens and closes with one hand. The flexible handle makes it comfortable to carry, whether you are out on a hike, training, or going about your daily routine.

Double-wall TempShield® vacuum insulation keeps drinks cold for up to 24 hours and warm for up to 12 hours. The slim design fits most cup holders, and the bottle is made from robust stainless steel that withstands everyday use well. It is dishwasher safe for easy cleaning.

The Flex Straw Cap is not intended for use with hot drinks, and the bottle should not be used on a hob, in a microwave, or in a freezer.