If you don't already have things put away and ready to go before the shtf then you'd better be planing to do without. Because you'll be one person of the hundreds or thousands in your little community that didn't prepare and whatever supplies are left are going to be desperately fought over.
Not to mention this takes between 4X and 10X more time than you think. Yeah, you can get your bugout bag done in a weekend. Congrats! You will now survive for a couple of weeks, and you are counting on things returning to "normal' after that time. What if they don't? Do you know how to use that pistol you bought? Let me guess.. you haven't fired it yet.
I thought I needed 3-4 months to get the Greenhouse and the Solar in. Its taken way more than that- and that was with steady progress and every summer weekend and 2 weeks of vacation thrown at it - and that has been the same with everything we have attempted. It takes time to research, it takes time to decide, it takes time ( and money) to procure, and then time build, to learn and to use. Even if you have millions, you will not be able to get the things we have done finished in less than 6 months, and it with shortages, riots, shipping problems, thievery, and general chaos inherent in a collpase, you will be lucky to get it done in a year at 2x the price.
If a bugout bag is all you can manage and afford, then yeah, do that. But don't have any illusions that its going to save you in a protracted situation.