Being a fan of bugging in as opposed to out, we don't have a BOB per se. What we do worry about is being stranded on the road, or while on a walk/hike. So in our vehicle we have a 7x7 three season dome tent, mating mummy bags (20 and zero degree), camprest self inflating pads (the thick ones, as we get older we like our creature comforts). In my day pack, carried on all foot trips out of sight of the vehicle, is a 10x10 nylon tarp with a jillion tie tapes, precut paracord, and aluminum gutter nails for stakes. Also a Thermo-lite Emergency Bivy Sack (the two person size). In anything near rain season lightweight rain gear for both of us, the rest of the year at least two 30 gal trash bags. I used to have some nice heavyweight orange ones, but they got too old, so now they are the less than desirable black ones...