Sack Head

Sack Head is a passive item added in The Binding of Isaac: Afterbirth.

Effects

 * Coins have a 10% chance to be replaced with Grab Bags. Bombs, Keys, Cards, Runes, and Lil' Batteries have a 20% chance.
 * This includes pickups spawned by most sources: room rewards, chests, slot machines, special shopkeepers, etc.
 * Golden Coins can reappear as a sack when collected.
 * Coins bombed out of a Donation Machine can become sacks.
 * The exception to this are pickups spawned by Isaac himself directly, e.g. with the likes of or, and contents of other sacks.
 * Spawns a sack upon pickup.

Synergies

 * Coins spawned from hitting enemies have a chance to become sacks.
 * Equality!: Sacks may drop new sacks while Equality! is active, potentially resulting in massive amounts of resources from a single sack.

Trivia

 * The appearance given by the item is most likely based on one of the trailers for Rebirth, where several naked people are wearing sacks with crying eyes , strinkingly similar to Sack Head