The BOBs and other kits I've put together for DW and myself, as well as some other family members, all have have TP, wipes and soap. The more a BOB s intended to be good for only 72 or so hours, the more I'd say just have the wipes.

I like bars of glycerin soap, if I need to have soap. I like the little packs of Charmin wipes and the small rolls of TP. For the kit I recently hid in the backyard, I used a full roll of TP, a couple full-sized packs of wipes and a full-size bar of glycerin soap.