Lost medium-sized black suitcase with bright green luggage tag near downtown Bozeman, possibly left in shuttle bus or airport.

I lost my medium-sized black suitcase with a bright green luggage tag attached while traveling in and around Bozeman. It went missing after I checked out of my hotel near downtown and I believe it might have been left in the shuttle bus or at the airport. The suitcase contains several personal items and my favorite sweater, so I'm really hoping to get it back.