A bag with shoulder straps, carried on the back, and typically made of canvas or other weather-resistant material, used for carrying supplies or personal belongings.
She packed her knapsack with snacks and a water bottle before heading out for the hike.
knapsackadjektiv
Attributive: relating to or designating the knapsack problem or ciphers in computer science and mathematics.
The researcher proposed a faster knapsack algorithm for large data sets.