BRIEFING Special Order Hydro Flask 18oz ◇ Brand new, unused item ◇ Other BRIEFING items (photo 5) are also available, please take a look if you'd like. Size: Capacity: 532ml Mouth Diameter: 48.5mm Body Dimensions Width x Height: 73mm x 220mm Weight: 320g Materials: Body: Stainless steel Lid: Polypropylene Gasket: Silicone rubber ■ Hydro Flask Hydro Flask was born in Bend, Oregon, USA. It's a brand of high-performance insulated portable bottles, created from the voices of people who enjoy an active lifestyle in a rich natural environment.