My BOB can be scaled quickly to the situation at hand and a best estimate of how things will play out. Or, while bugged out if I have taken the whole shebang I can remove various parts depending on what I need to do assuming I have established a "base".
For example, if we're talking a short term bugout in which it appears as if I won't have to do any heavy work, my full size axe (man I hope I get that fiskars axe for Xmas LOL) and prybar are the first to go.
As another example, if it appears that I will be capable of easily finding some sort of shelter or if I think I'll have the time to make shelter in an event where speed and distance isn't a primary concern the tent can be left behind.
Beyond that, I can also drop or add equipment depending on the season or any number of factors.
Having said all that, in most cases I will attempt to take all I can.
As others have mentioned above, it will depend on what you're capable of carrying and what situation you're preparing for. Get out there and put yourself to the test. <img src="/images/graemlins/smile.gif" alt="" />
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"Learn survival skills when your life doesn't depend on it."