Satyr Sack

The Satyr Sack is the item Zagreus needs to get in order to bribe Cerberus and get past the Temple of Styx.

Zagreus describes it as a stinky sack with an unknown content that Cerberus seems to love. If the squeaking noises heard when collecting the sack and the 'victory' banner are to be believed, the sacks contain vermin, most likely Crawlers.