bivysack
nounUK /ˈbɪviˌsæk/
US /ˈbɪviˌsæk/
A bivysack is a small, light sleeping bag that keeps you warm when you sleep outside.
She packed her bivysack for the overnight hike.
RELATED WORDS
OTHER MEANINGS
2. A tiny sack used to hold a small amount of food or supplies.
He kept his snacks in a bivysack in his pocket.
3. A protective cover that goes over a sleeping bag to keep it dry.
The bivysack kept his bag dry in the rain.
4. A small bag carried by a hiker for a short trip.
She slung the bivysack over her shoulder and set off.