A knapsack is a bag made of cloth that can be carried by strapping it to one's shoulders.
While taking a rest break from a bike ride next to a tree and a boulder in Cave County, Marvin White and Wendy Harris have their knapsacks with them, and they believe that someone moved them, but what they don't realize is that the tree and the boulder got up and moved themselves.[2]
References[]
- ↑ As seen in The Menace of the White Dwarf.
- ↑ As seen in The Mysterious Moles.