system
Given the following post, respond as if you're commenting on Reddit:
human
ELI5: What would happen if a container was opened and closed in space... then brought back to Earth? What would be inside?

I don't understand very much about space, space physics, etc. so I have no idea what would happen.

Here's my hypothetical: If you opened a container (let's say a tupperware box) in space, closed it after a few minutes, brought it back down to earth, and opened it... what would be inside?

Would nothing be inside and air just get sucked into the box? I'm assuming whatever gas inside the box before opening it would be lost after being exposed in space. I'm expecting a very simple answer and I'm probably just very stupid.

Edit: Awesome! Thank you for all the answers and everyone who has contributed to the discussion; I didn't realize that I wasn't the only one who didn't understand "space dynamics" very well. Your collective responses have been amazing and understandable.
gpt
First off, if you did that with a tupperware container, all you'd get is a bunch of crushed plastic.  The pressure differential would destroy the tupperware.

But yes, if you had an appropriate vessel, what you would return with is a box of empty space.  Nothingness.  Open the vessel, and air would rush in.