I travel frequently and to a wide variety of environments. My BOB goes everywhere with me, it just may change its appearance (switch to an environment appropriate bag) and lose some things that can't go on an airplane (until I retrieve my checked baggage, then it returns to its normal composition). I carry it to work, to the beach, to meetings (although it may stay in the car) and to my friend's house. Each member of my family has one, and they carry it as well, within limits (kids can't carry a pocket knife into school, or lighter of matches); and I generally maintain their bags. Regardless of the emergency or environment, I have the essentials, just in case. I may add if I have time, or I may pack an appropriate suitcase or duffel bag if time permits. Time of year, weather, destination and time dictate what goes in them. But my BOB goes with me and it gets used, and repacked, resupplied and checked upon my return.