I didn't have room for my folding stadium chair or motorcycle cover. I did have room for basically everything I need for 10 days on the road - except water. The items on top are light so the bike should handle as good or better than if I had a passenger.
I'm looking forward to the whole experience but I'm particular excited to have a chance to ride on the Beartooth and Going to the Sun highways.The Beartooth highway starts not to far of Red Lodge and takes you to Cooke City and the Northwest Entrance to Yellowstone Park. The road reaches a maximum elevation of 10,947 feet fairly quickly via a series of switchbacks. It's a very scenic drive - with dramatic drop-offs and a chance for quick weather changes.
As far as roads with spectacular mountain scenery in Montana go, I'd say the Beartooth highway is about a tie with the Going-to-the-Sun highway - although in my experience the Beartooth highway has less traffic.