Once you have all your gear assembled to make your trip, you need somewhere to put it. Naturally this is the “bag” part of “bug out bag”. Now many people get all excited at this point and buy some sort of tactical bag with Molle attachments for all of their accessories. I think we can all agree the Molle type bags look awesome and are very functional. If you just have to get one, then do it. However, if you are really thinking tactically, any advantage you get from being able to attach items to the outside of your bag will be far outweighed by the negative perception it forms in many people’s mind. I instantly go on alert when I see someone with military gear, and I assume they are carrying concealed. Is that how you want everyone you come into contact with to treat you? It makes more sense to have a normal camping style backpack in earth tones that will not stick out like a sore thumb.
Either way you go with the bag, just having a 72-hr Bug Out Bag of some sort puts you ahead of 90% of the population.
Good luck getting from A to B.