After printing a couple other models that didn't seal properly, I decided to pick a well-designed model and make a few changes to seal it as much as possible.
There are thee versions of the tray:
I've also provided an optional snap-fit lid, as well as a funnel adapter that can be used alone, or attached to this funnel.
The author remixed this model.
I combined the lid with the body, and punched a hole in it.