Each AR gets one of those and I try and keep them full.
The only right answer about how many mags to have loaded is "all of them".
If any of us are in a situation where all of our loaded mags end up getting used. Then we have bigger problems which would not be solved with just one more mag.
I'm more worried about water in summer and heat in winter. I have a "place to go" picked out, but not sure all in family can get there with GPS.
We have a hadfull of FRSs and a few Ham radios, but not a great shelter pack.
Bug out bag has Israeli bandage, fire starter kits, mini fak, a bunch of $20s, some iodine tablets and a whistle plus knife. Flashlight and sling on every rifle.