Binding of Isaac: Rebirth Wiki

Mystery Sack is an unlockable passive item.



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

In-game Footage[]


  • 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 (Sack of Pennies Sack of Pennies, Added in AfterbirthRune Bag Rune Bag, Bomb Bag Bomb Bag, and Added in Afterbirth †Sack of Sacks Sack of Sacks), that isn't a counterpart to other existing bag items, rather being a combination of some.


PC A3ES 1TQN (First floor, Treasure room next to spawn)

PC QHKQ ZE4N (First floor, Treasure room next to spawn)

PS4 CGVC XKY3 (Play as Isaac, and reroll the first item in the secret room just below the starting room)

Vita Q73A BMMP (adjacent to starting room)

Switch Greed mode only 3CAR V7Z0 (First Golden Treasure Room)