Jinn Bottle

Despite it's name, a Jinn Bottle is an enemy, not an item, in 1000 A.D. in Chrono Trigger. Octoblushes like to hide inside them until invaders arrive when the Jinn Bottle spits them out to attack.

The Village of Magic
Crono and his party encounter a few Jinn Bottles on their journey through Heckran Cave.