Totally a White Bag: Because what kind of monster would trick their fellows with a fake one?
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Ocean Trench Event Chest
Puppet Master’s Encore Event Chest
A gag item which dropped from November 11 to November 13 in Ocean Trench event chests and during Halloween in the Puppet Master’s Encore event chests. Spawns a fake white bag, visible to all players, which explodes 4.5 seconds after spawning.
The 2017 MotMG Moss Bag can potentially drop this.