Bursting Sack

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

Effect

 * Certain spider enemies no longer target or deal contact damage to Isaac, nor actively spawn other enemies. Spiders that are spawned from enemies that are not affected by Bursting Sack will also remain neutral.
 * Affected spider enemies that deal no damage to Isaac whatsoever include: Spider, Big Spider, Swarm Spider, Strider, Rock Spider, Tinted Rock Spider, Level 2 Spider, Trite, Baby Long Legs, Small Baby Long Legs, Crazy Long Legs and Small Crazy Long Legs.
 * Spiders and Big Spiders don't blink red when Isaac has the item.
 * Swarm Spiders don't blink yellow when Isaac has the item.
 * Trites will still uselessly try to target Isaac.
 * Affected enemies that deal no contact damage but can still damage Isaac through other methods include: Ragling,  Rag Man's Ragling,  Blister, Ticking Spider, Migraine,  Wall Creep,  Blind Creep,  Rage Creep,  The Thing, Soy Creep, and Tainted Soy Creep.
 * Except for Ticking Spiders, Migraines, and Blind Creeps, all other spiders will still uselessly try to target Isaac for contact damage.
 * Coal Spiders aren't aggressive to Isaac, but will still deal contact damage.
 * Unaffected spider enemies include Trite, Ragling, Rag Man's Ragling, Blister, Wall Creep, Blind Creep, Rage Creep, and The Thing.
 * Twitchy is the only "spider" enemy that is still aggressive towards and will still damage Isaac, as they're classified as a Gaper rather than a spider.


 * This item belongs to the Spider Baby set. Collecting three items from this set will transform Isaac into a humanoid spider.

Trivia

 * This item is similar to, only affecting spiders instead of flies.
 * Befitting the name, this item's appearance is similar to a bursting Sack.

Seeds
Z0MB 7AMP (First floor Treasure Room) 2MFE VQC9 (Treasure Room next to spawn)