I use a small mirror on an extendable rod (much like a car aerial), which I think I found quite cheap at a tool supply place. It collapses down to about 4 inches, so stows easily in the bag. Quite useful (if a bit awkward) for setting aperture and shutter speed, too, when the camera's a bit high for me to see the top of the shutter.
As for the level, I carry one of the shoe-mount cubic ones, although I use it less now. I got a good Manfrotto tripod a while back, with levels built into the yoke and the head, so I don't need the shoe-mount one except when I have to do something odd, like extreme rise via tilting the bed up, and correcting the standards to level.
Cheers,
Don Wilkes
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