While I will readily agree that laying in a supply is an important and valuable exercise, it's not foolproof. Supplies can be stolen, destroyed, or washed away.

In a truly LTS situation, I would argue that knowledge is more valuable than a one-person lifetime supply. It can provide trade items, you can pass it along to help your family, friends and community without having to transport or give up your own supplies. It can replenish supplies that weren't stored up for a lifetime. I've got a lot of stuff stashed, but I know I don't have a lifetime supply of soap and toothpaste or really anything else. Certainly not enough for a family's consumption.

Skills like weaving, canning, carpentry, smithing, farming, hunting, identification of wild plants, &tc. are all very important should society collapse. Or should you find yourself stranded away from your supplies in some remote area. You can travel with knowledge, but it's a lot tougher carrying $40 worth of soap. ;-)