Mystery Sack

Item Icon
Pickup Quote	"?"
Entity ID	5.100.271
Item Pool	Golden Chest Beggar Secret Room Treasure Room Secret Room Treasure Room
Quality	2
Item Tags
Collection Grid	(page 3, column 6, row 7) (page 3, column 6, row 2) (page 3, column 7, row 2)
Unlock Method	Defeat The Lamb as Eden

Mystery Sack is an unlockable passive item.

Effects

• Spawns a familiar that drops a Heart, coin, Bomb, or Key (or any of their variations) alternatingly every 5 or 6 rooms.

Synergies

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

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

Seeds

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 3CAR V7Z0 (First Golden Treasure Room)

The Binding of Isaac: Rebirth
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