KNAPSACKS is a playable word

knapsack Scrabble® Dictionary

noun
pl. knapsacks
a bag carried on the back
83 Playable Words can be made from "KNAPSACKS"
   2-Letter Words (6 found)
   3-Letter Words (19 found)
   6-Letter Words (5 found)
   8-Letter Words (1 found)
   9-Letter Words (1 found)