The Hydro Flask 21 oz Standard Mouth bottle has a capacity of 621 ml. The bottle features Temp Shield™ technology, a double-walled vacuum insulation that keeps hot beverages hot for up to 6 hours and cold for up to 24 hours. The 18/8 stainless steel used in its construction guarantees the preservation of flavors, aromas, and consistency, while the extremely durable, scratch-resistant powder coat ensures a secure grip and a non-slip bottle. - Black - capacity 621ml - 18/8 stainless steel - Temp Shield™
