hipflask
/ˈhɪpˌflæsk/
noun
- A small, flat container for carrying alcoholic drinks, usually in a pocket or attached to a belt.
- He pulled a hipflask from his jacket and offered her a sip.
- The hiker kept a hipflask of whiskey for warmth during the cold nights.
- She bought a silver hipflask as a gift for her father's birthday.