Knapsack
Knapsack , noun
[Dutch knapzak; knappen to eat + zak a bag. See Knap, transitive verb, and Sack.]
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; as, to hike up the mountain with lunch in a knapsack.
And each one fills his knapsack or his scrip
With some rare thing that on the field is found.