Jar of Flies

Jar of Flies is an activated item added in The Binding of Isaac: Afterbirth.

Effects

 * Killing an enemy adds a fly to the jar, up to a maximum of 20.
 * Upon use, releases Blue Flies equal to the number of flies in the jar.

Synergies

 * : Flies are bigger and deal double damage.
 * Fish Tail: Doubles the number of flies that spawn.
 * : Flies will be gained even while the Jar of Flies is in the inactive slot.

Interactions

 * : No effect.
 * : Flies will not collect when absorbed by Void, making the interaction worthless.
 * No effect.

Trivia

 * The item's pickup quote references the tagline of the Pokémon games. The quote said "Gotta catch 'em all?"
 * With Booster Pack #2, this item's sprite fills up with more flies depending on how many flies it contains. This is based on this Steam Workshop mod by Stewartisme.
 * The item is likely a reference to the Alice In Chains album of the same name.

Seeds
KTHW HTAY (First floor, in the shop)