Webster's English Dictionary

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knapsack

knap.sack \'nap-.sak\ n [LG knappsack or D knapzak, fr. LG & D knappen to 
   make a snap]ping noise, eat + LG sack or D zak : a usu. canvas or leather 
   bag or case strapped on the back and used esp.  for carrying supplies while 
   on a march or hike