My impression of having a Response Pack was it was full of all the stuff you would use in Response to an Emergency as such or as a small Bung Out Bag.. be it over a very short period of time,
Mine Started off as that... over time has evolved to a dump bag with a few use full/less things in.. while looking at it I began to think about getting back to its intended use...
That's what I use my waist kit for. It basically has the bare minimum gear I need to live (and my phone). If I were to pack a different pack for the same purpose, it'd have the exact same items in it. Reason I stick with the waist kit is to keep it small. If I use a bigger pack, I'll fill it (as I reckon everyone would... it just happens)