A couple other points to consider as you develop your "Emergency Survival Kit" or "Bug-out Bags" or other emergency preparedness items.
Determine what YOU need
There are many scenarios that can play out for each one of us. Be it a natural disaster or whatever, each has to determine what the plan is for themselves and to have whatever items are necessary for your situation. It's a worthwhile exercise to go through many emergency scenarios that could happen in your area and develop a plan for what to do for each. Once you developed your plan, come up with a secondary plan in the event the first fails or isn't viable.
Time to get everything together
Should you need to bug-out (or even if you're staying home), what are your emergency essential items? Are they scattered around the house? Can you find them? Do you actually have them?
It's a good idea to at least compile a list of items you think you'll need and then annotate whether you have them or not. If you do have them, give a location (I do this in Excel). If you don't, make a shopping list (then see "cost" below). What about seasonal items like winter clothes?
After getting my bug-out-bags, duffel bags and tubs filled, I was surprised at how long it actually took me to do it. In the event of an emergency, I wouldn't have thought of 1/2 of the stuff. At least make yourself a list (and have it handy) of the things to grab/gather in the event of an emergency. My preference is to have them already packed. It's a no-brainer then. I (as well as the wife and kids) then know exactly where everything is should it be needed.
Cost
Many of us have "staples" for general emergency preparedness. This may include stocked freezers and pantry, generators, extra fuel...
Where I got caught myself was in the details. Once I compiled a complete list of what will or may be needed, I realized I came up short. As long as I was staying put (at home), I was pretty well prepared. If I had to leave the house is where I came up short, especially if I went into a camping or other non-structural (with all the amenities) living.
Those backpacks I showed above... As loaded, probably $1000 for the 4 of them. That one caught me off guard.
Those Rubbermaid tubs as stocked. I haven't counted but it could easily be another $1000.
Tent, sleeping bags and other camping stuff. Probably another $1000.
Food and cooking equipment. Another $1000
Body armor and Night Vision scope. Easily over $1000.
Guns and ammo not listed. You don't want to know.
Generators, power inverters, batteries... easily another $2500.
I guess where I'm going with this is that although I "thought" I was prepared, once I created a list of what was needed, I fell way short. A couple grand later after thinking I was already all set, and I'm a little closer. If you need to buy things, it may take a bit of time to get everything together if you need to spread out the cost over a period of time.
The way I look at it, except the food and batteries (which will get rotated), everything else is good forever. Should we need it or not, they're things I can use with, then pass on to the kids (primarily thinking of camping gear here).
Rotate stock
As just mentioned, be sure to rotate your perishable items. Food and any batteries in particular. Shake your fire extinguishers a couple times a year.
Test your plan
At any time, create yourself a disaster situation and test your plan. This may be as simple as throwing the main electric (and water?) off on the house and see how you do for a long weekend. To make it a bit harder, do that in an extreme weather climate for your area (hot or cold).
How about grabbing your emergency "stuff" and kicking yourself out of the house and live in the yard for a few days.