I don't necessarily agree with the "nothing tactical" looking mindset, unless of course your GHB or BOB is for use with a mechanical breakdown or general camping and not any kind of societal breakdown. If we enter a time of a world WROL or a true SHTF situation you could be wearing a Hello Kitty backpack and be a target. You could be holding two Walmart sacks and be a target. And (depending on how deep into the event we are) no matter where you are, you are going to stand out and no matter what you are carrying, someone else is going to want it. While discreet GHB/BOB are great for not giving away what you have in the here and now, for testing it out while hiking or camping, for not alarming anyone who might see it in your vehicle and think "active threat". But if things go awry I want functionality over appearance. I want fast access to spare magazines and med kits without having to take the bag off. I want pouches that can be removed or re-added. And in the end, even with a nice discreet earth tone Jansport book bag, I am pretty sure when they see my chest rig full of AR15 and pistol magazines, a Kabar knife and an attached pistol, with a scary black rifle in my arms, no one is going to say "Hey, that guy's backpack is a bit too tactical for this TEOTWAWKI situation. He is really standing out". Maybe that's just me. After all I have piles of government issued tactical gear and have never cared if anyone noticed it or not. Nor will I if the SHTF. 
