The Knapsack is an on-player storage item similar to a backpack. It has the storage capacity of a chest, stores its items when taken off, and can only be accessed via its GUI.
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Where to put the Knapsack and its icon
To access the Knapsack, place it in the designated slot of the Armor GUI. After exiting and re-entering the inventory, a Knapsack icon will appear when displaying the Armor GUI. Items can be placed in the Knapsack, and will remain inside even if the Knapsack is taken off. Right-clicking while in-hand WILL NOT work. The knapsack has the same storage space as a chest.