Movie about tiny people

Hello!
When I was little, in the 90s, I’ve seen a movie or a TV-series (on TV). It was about a couple of people who are friends with tiny people. The people could turn themselves into tiny people by drinking this red (i think) potion from a small bottle. The tiny people had a village in a forest. I remember that the woman was hiding the tiny people in her backpack on a plane(probably plane, not sure). The movie/series was in colour. It’s not The Borrowers or the Gnome-mobile.

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