Hydro Flask 18oz Standard Mouth Flex Cap

The 18 oz Standard Mouth bottle is just the right size for staying hydrated. Uses TempShield double wall vacuum insulation to keep your water refreshingly ice cold for up to 24 hours. Plus, it resists condensation, so the sides of your bottle stay dry. Unique double wall vacuum insulation protects temperature for hours. Cold drinks stay icy cold and hot drinks stay piping hot so you can stay refreshed for any adventure.