The Piggyback is a type of Backpack which requires 4 Pig Skins, 6 Silk, 2 Ropes and an Alchemy Engine to prototype. It is a larger Backpack which has 12 inventory slots but reduces walking speed by 20% while equipped. It has 4 more slots than a Backpack, but 2 fewer slots than the Krampus Sack. It cannot be placed in the inventory or in Chests.

As of the Reign of Giants update, A Feet of Strength, in RoG-enabled worlds the piggyback and it's contents are waterproof and will not cause sanity drain while equipped. The piggyback does not give the player any rain resistance, and used in conjunction with an umbrella will not protect the rest of the player's items from wetness. The movement speed penalty was also reduced from -20% to -10% in this update. Used with the walking cane, the penalty is negated and the player's speed increased to 115%.