Apart from my SUV, I have a Diamondback Mountain Bike and a Dahon Foldable as my secondary BOV. I worked overseas 2/3 of my time, therefore my Dahon Foldable is stored aboard in my overseas office together with my other BOB.
Things to go with a bike may be: spare tube, tube replacement tool, punctual repairs, front and rear lights, bell, speedometer, a travel rack, a good lock, water bottle plus holder, portable air pump, bike repair tools, helmet etc.
A would say a reasonable good MTB should have a pair of good brakes, 27 speeds to allow one to climb hills, ride on dirt tracks and also run smoothly on flat metal roads with reasonable speed, rigid or suspension fork etc.
Hybrid are more for road actually, with a different gear ratio, frame, wheelset (diameter), tyres and tyre width as compared to MTB and Road bikes - choose wisely as to what kind of terrain your route may be.
Lastly do choose the right bike frame for your Body/Height.
Train and practice with the bike.......biking is serious business when u actually load it up and carrying a BOB.
Hope my limited knowledge helps, Cheers!