Start your BOB with a few good items and work from there. I would recommend to start:
Good sheath knife
Saw or hatchet (whichever style you prefer)
Fire making implements, tinder and ignition sources
Cotton or wool blanket
sharpener
signal mirror, whistle and blaze orange gloves (for waving your arms)
100feet of paracord
Tarp or rainfly
canteen, water bottle or steel can (maybe all three)
Hobo stove (easy build from a tin can)
[youtube:2sw92by1]http://www.youtube.com/watch?v=MlIL2LSXgOE[/youtube:2sw92by1]