The small water-breathing device Carl loots from the dead Loita — usable only by a knee-high, gilled creature.
Loita's rebreather is the compact fish-breathing apparatus Loita wore around her neck in place of the armored suit Zev always insisted on — periodically spitting water and pooling it around her. Its moisture was the incidental catalyst that let the Hobgoblin Disco Ball residue eat through the Veriluxx Donut toy's panel, killing her. Unable to reach his inventory during the liaison hold, Carl shoves the looted device into his boxer waistband, only stowing it properly once his interface returns.
About the size of a cat collar and not very valuable — usable only by a knee-high creature with gills — he keeps it anyway, on the principle that you never know what will matter.
A small neck-worn rebreather device roughly the size of a cat collar, made for a gilled aquatic creature; it occasionally sprays a little water.
A minor looted trophy off the murdered handler — a keepsake and possible future utility.