waterproofsack
nounUK /ˈwɔːtəpruːf sæk/
US /ˈwɔːtərpruːf sæk/
A waterproof sack is a bag that keeps water out so things inside stay dry.
She packed her clothes in a waterproofsack before the boat trip.
OTHER MEANINGS
2. A sealed bag used to protect food and gear from rain while hiking.
He hung the waterproofsack from a tree to keep the ants away.
3. A bag used by swimmers to carry towels and phones without getting them wet.
My waterproofsack floated beside me in the pool.
4. A heavy-duty sack for storing emergency supplies in wet places.
The rescue team kept blankets in a waterproofsack.