Knapsack (disambiguation)

The word knapsack can refer to:
 * a backpack
 * Knapsack, Germany, a locality of Hürth, Rhine-Erft district, North Rhine-Westphalia
 * the knapsack problem, a math problem
 * the subset sum problem, a special case of the above
 * Naccache-Stern knapsack cryptosystem, a cryptosystem based on the knapsack problem


 * Knapsack (band), an American band
 * "Knapsack!", an episode of Aqua Teen Hunger Force