The intent of this post is to tie in the related, practical application concepts of tactical gear, fitness, teamwork, logistics, and tactical loading, in order to present a realistic and logical way to approach the subject. There are a number of related factors at play here.
Mission
We often utilize the military terminology of “METT-TC” in order to analyze our mission and thus apply it to the gear that we may carry. Factors such as weather, duration, and the specific mission that you are conducting play into considerations of what to carry. We must be realistic in what we plan and train for now, and thus pack for. Base it around what we think we realistically might be doing in a collapse situation. I put it to you that most people will be engaged in local defense and security patrolling. They may also deal with presence/ground domination activity (GDA). People will be patrolling in and around their homestead and perhaps local community. They will thus not be engaging in multi-day ruck-missions out into the boondocks. This has relevance as we examine the other factors.
Logistics
However much you pack, you will ultimately need a resupply. Many people with a “prepper” mindset want to pack too much “just in case” they need it. I would advise a different approach. I recommend you plan for that resupply and set up a logistics chain. If it allows you the ability to maneuver under fire, it would be better to have to temporarily make do without something than carry a huge load. Thus, you could consider something along the lines of planning to utilize existing vehicles. Trucks, ATVs/UTVs, and even perhaps horses or mules can support any mission that you plan that you suspect will go beyond one day’s rations. This would be one first line ammunition scale (i.e. what is realistically carried on the person as part of a deployed load-out).