knapsack
nounUK /ˈnæp.sæk/
US /ˈnæp.sæk/
A knapsack is a bag you carry on your back.
She packed her lunch and a book into her knapsack before the hike.
OTHER MEANINGS
2. A bag with shoulder straps used by soldiers to carry supplies.
The soldier adjusted his knapsack before marching.
3. A small bag for carrying personal items on a journey.
He slung his knapsack over one shoulder and left.
4. A container used for carrying school supplies.
The boy put his notebooks in his knapsack.