[1] : The Collaborative International Dictionary of English v.0.48

knapsack \knap"sack`\, n. d. knapzak; knappen to eat + zak a
   bag. see knap, v. t., 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.
   1913 webster +pjc

         and each one fills his knapsack or his scrip
         with some rare thing that on the field is found.
                                                  --drayton.
   1913 webster
see also:
knap sack 

[2] : WordNet (r) 2.0

knapsack
     n : a bag carried by a strap on your back or shoulder syn: backpack,
          back pack, packsack, rucksack, haversack
see also:
backpack back pack packsack rucksack haversack 

Knapsack >> K Words
Knapsack, definition of term: Knapsack
knapsack_pag1.html