Well, this is one of those differences in opinion in what goes in BOB- I want 72 hours of water, but will settle for 36 hours. That's 12 pounds of water, a conservative estimate, plus the weight of the water vessels. 24 pounds a small camel's worth of bulk if I'm carrying what I want to have. When he's assembled, my BOB is one I can only grudingly call a 72 hour pack becuase I know every source of water along my likely foot-evac routes.

I rate BOB's life by how long I can be self sustaining out of him. Water is the real weight in my box of stuff that is to go into the pack as needed. Without the water supply and the stuff on my belt, but with food, it's a twenty-five pound pack. Which with the water really is the most you want if you need to get out of dodge on the hard road, at least in my opinion.

Keep in mind, you have BOB, plus (hopefully) a ditch module you can grab if you have to dump him, your PSK, your EDC and a few toys slipped into your pockets. (I like layers, what can I say?) Add in a good pair of boots, the clothes on your back and the hat on your head, a sidearm if you are wanting one, a staff, and Murphy's fingernail clippings, and it comes up to a tidy weight. Maybe I've got a harder road than some, I don't know. I just know I plan for the worst that I can run from.

I think the other thing here might be difference of BOB philosophy- to me, BOB is the guy who gets you to your destination, he isn't your destination. If you don't know where you are going, you might want to be digging in, unless you think you can outrun the danger.