I wouldn't get too hung up about the definition of "bug out". It means different things to different people and situations. Bugging out 100 miles before a hurricane makes landfall two days from now is different than when you're woken up in the middle of the night by the smoke alarm and you need to get out of the house NOW! Whatever kit you grab in either situation is legitimately a BOB. You need to think about the situations relevant to you and then put a kit together that is appropriate.