What does the word knapsack mean?

Usage examples for knapsack

  1. Later that evening I would resume my journey, taking the knapsack with me. – Look Back on Happiness by Knut Hamsun
  2. I might walk with that machine you talk of; but never could march and carry a knapsack! – Half a Century by Jane Grey Cannon Swisshelm
  3. He had no knapsack to serve as a pillow, no blanket, no cup, and his position across the doorway was cold and uncomfortable; but even after I had made a better place for him, he objected to leaving two companions, who lay next to him, and I could not find room for all three together, even on that dirty floor. – Half a Century by Jane Grey Cannon Swisshelm