ON THIS WIKI
Big Backpack is a compact storage which can be carried by a player. Big Backpacks have 54 slots available (the same amount as a Double Chest). If a player uses a dye when crafting a Big Backpack, it will result in a colored Big Backpack, making it easier to distinguish backpacks used for different items and blocks.
Note: Placing a dye in the middle will result in a colored backpack.