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While I was in the Civil Air Patrol, we discussed 24/72 hour bug out bags at great length. I will be using their lists here as I am not trying to recreate the wheel. They did a great job breaking that ground (and working off of the teachings by the uniformed service and other emergency agencies).
I urge you to consider that will work for YOU. If you are carrying something that you will never use, see if you can replace it for something of more value to you. Perhaps you need some powered drink flavors as you are not a big water drinker. Anything to help keep you hydrated. Remember, everything that you pack, you are carrying, for who knows how far.
Have an understanding of your capabilities. Yes, we are often able to do this to save our butts in a pinch, but how long will the adrenalin keep us going? Be sure to try your pack. A 24 hour pack is not bad to manage, but a 72 hour or longer is heavy. wear that pack around the house/yard for an hour and think of how you are doing. You are not helping yourself or your party, if you become a medical emergency as you try to make your way to safety.
Guys, get over the ladies’ feminine products and think about putting a few mini pads in your pack. A) you may help a lady who did not think of them (or thought that they would need them). They are also nice first aid items as well as having other uses. Quit fearing the pink aisle!
24 hour bug out bag (go kit) Credit to LEXINGTON, KY CIVIL AIR PATROL – VAN METER CADET SQUADRON (Thank you for your wonderful work cadet!) As you review what the CAP suggests carrying for the 24 hour and 72 hour kits, remember that they are members of the Air Force Auxiliary. (Ignore the UDF team information. It is used to locate a downed aircraft.) So, instead of the uniform items, you will replace them with sensible clothing items, food, or other survival items. Your local climate will have its own needs to consider. I am fully bearded so the shaving kit is wasted space/weight to me and I will use that space for an extra cliff bar or some other item that I will make use of. When you are considering your 72 hour bag, it will likely be a backpack with a frame. this is to distribute the weight batter, allowing you to carry more. You may also want tactical web gear, it is actually quite comfortable once you have it adjusted to your fit. having the ability to attach gear in easy to reach places is very useful. This may just be my military experience talking, but swing by your local military surplus store and see what you think. Their staff should be able to help you thinking of missed items as well. They tend to be great in this line of thinking.
In our vehicles, we keep an emergency box with a first aid kit, tool kit, blanket etc. for general travel needs. That kit can help you get to your home where your bugout kits are likely going to be. If you cannot get to your kits, that box may need to have items to help you get by until you ARE able to get to supplies, either at home or somewhere else.
Additional links that I found had useful information to consider.
A great page I found on the subject with nice rational and well thought out: https://www.emergencyprepgear.com/72-hour-kit
https://www.usar.army.mil/Portals/98/Documents/DSCA/72%20hour%20Kit.pdf?ver=2019-05-14-101552-603
This page is still under construction.