Backpack

Backpacks are a subclass of Miscellaneous Items in Fortnite: Battle Royale. They are mostly designed to aid players’ mobility.

Functionality
Backpacks take up an inventory slot (like weapons and consumables). Only one Backpack can be carried at a time. If players pick up a different Backpack, it will be automatically swapped with the one currently equipped.
 * While a Backpack is equipped, Back Bling cosmetics will be hidden.
 * Back Bling will be reapplied when the Backpack is no longer equipped.

Trivia

 * The Hunter's Cloak replaces the player’s backbling in a similar fashion to Backpacks, however, it only does so when ‘consumed’ and can be used with other Backpacks like the Inflate-A-Bull and thus isn’t considered such.

Rucksack