This is the prop Stasis Container that was used on the Star Trek: DS9 episode Invasive Procedures (Season 2, Episode 4). Odo (a shape shifter) is forced to revert to his liquid state and get into the container. It's then 'activated' (closed) effectively imprisoning him inside the device.
It's made out of various forms of plastic with a metal iris installed. A servo is connected to the iris which allows it to be opened and closed via remote control, is demonstrated in the video.
......I want one
horaciosi 3 weeks ago