This word is acceptable for play in the US & UK dictionaries that are being used in the following games:

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n. A bag made of sturdy material and furnished with shoulder straps, designed for carrying articles such as camping supplies on the back.

n. A case of canvas or leather, for carrying items on the back.

v. To go hiking while burdened with a knapsack, usually overnight (or longer.)

n. A case of canvas, leather, nylon, or other sturdy fabric, fitted with straps, for carrying on the back the food, clothing, or other supplies for a soldier or a traveler.

n. A case or bag of leather or strong cloth for carrying a soldier's necessaries, closely strapped to the back between the shoulders; hence, any case or bag for similar use.

n. a bag carried by a strap on your back or shoulder

"Her old knapsack is ready with good luck talismans, the Christmas and birthday cards from him and a minimum amount of clothes and cosmetics."

bag   

backpacking    camping    backpack    hiking   

kitbag   

backpack    rucksack   

backpack    briefcase    Windbreaker    rucksack    haversack    satchel    wallet    raincoat    parka    portmanteau