I have two: what most would consider to be a BOB, and a purely outdoor oriented small backback with stove, mess, sleeping and shelter in it, and not much more.

I can turn the pack into a pretty comprehensive kit in about 5 minutes out of the BOB and by grabbing pre-packed water. The pack has a bladder in it that I do not keep filled. There is enough water in my truck to fill it and a lot more, if need be.

I can't keepanything of much value in my truck ('92 ange Rover) due to theft problems. I do keep a very bare-bones equipped GI butt pack in it (HD rescue blanket, small food kit & nesbit, 100' para cord, 9 x 12 2 mil. drop cloth & a competent sheath knife), plus the usual car stuff, plus a decent hatchet & saw, 50' rescue-grade rope & 'biners w/ descender, old ammo can with a few 2nd rate tools, etc. All camo'd with a ratty bath towel or two.

When I moved here, I had been here two nights before the truck was cleaned out. Now, with this set up and a theft-proof radio, I don't even lock it. It has survived two years that way, knock on wood.

Remember Douglas Adams catch phrase from 'The Hitchhikers Guide to the Galaxy': "Never go anywhere without a towel."