Binding of Isaac: Rebirth Wiki

Mystery Sack is an unlockable passive item.

Effects[ | ]

Notes[ | ]

  • (in Repentance) Familiars that follow behind Isaac have a certain priority in how close their position is to him over other familiars, with Mystery Sack having the lowest priority at 6th and thus being farther from Isaac than familiars of different priorities.
  • Can spawn troll bombs.

Synergies[ | ]

  • Collectible BFFS! iconBFFS!: The familiar drops pickups alternatingly every 4 or 5 rooms.

In-game Footage[ | ]

Trivia[ | ]

  • Before patch 1.04, this item did not drop any items or do anything at all. Why it did not work remains a mystery.
  • This item is the only "bag" item (Collectible Sack of Pennies iconSack of Pennies, (except in Rebirth)Collectible Rune Bag iconRune Bag, Collectible Bomb Bag iconBomb Bag, and (in Afterbirth † and Repentance)Collectible Sack of Sacks iconSack of Sacks), that isn't a counterpart to other existing bag items, rather being a combination of some.