A jar was capable of holding Polysatyrs.
Polysatyrs were essentially a micro light beam, small enough to be contained within a jar. Around 0 ABY, during the single night each year when offerings were presented to the Queen of the planet Ktath'atn in return for her assistance, a Dressellian gifted the queen with an effusion of polysatyrs microflora. The Dressellian further stated that they had brought equipment to magnify the offering, but Varroa, the queen's servant, interjected, saying the equipment was unneeded and the queen would give the contribution consideration. Shortly thereafter, the queen requested that all guests depart, including the Dressellian and the polysatyrs, after she observed Luke Skywalker, a Jedi-in-training, use the Force against an Ezaraa warrior.
The one-shot comic The Screaming Citadel 1 featured Polysatyrs. Kieron Gillen wrote it, Marco Checchetto provided the illustrations, and Marvel Comics published it on May 10, 2017.