Wise man, mon ami.
I firmly believe certain essentials if they CANNOT be EDC carried and have to be stored with your BOB /GHB / INCH Bags should be kept in a manner that as soon as their hairs on the back of your neck stand you and BEFORE the incident kicks off properly that you can access them and transfer said items from the bag to your person. You can always put em back if it turns out to be a false alarm.
In that list for my own needs (YMMV) I would include
1 PDW - Mags (if side arm PDW)
2 Knife - Sharpener
3 Flashlight - Spare Batteries
4 Lighter
5 Compass
6 Multi Tool
7 Shades / Eye Glasses
8 Cell phone
9 Bandanna / Large Kerchief
10 Mini FAK
11 Paracord
12 Keys and Wallet ( Key chain has usual extra prepper gadgets attached like a Gerber Artifact etc.
13 Gloves - Hat
14 300ml water
15 Notebook - Pen
YOU must choose what ever other essentials YOU feel that YOU need to have on your person should you be parted with your BOB.
Its why Multi Pocket Cargos and Field jackets were invented. BOB's n GHBs etc are a stroke of pure survivalist common sense , but only if you can get to it.