Personally, I think the OP raises a good point. I once looked into such package deals too, but took the time to itemize it, and realized I'd be
better off assembling it myself. Props to the OP for sharing the mistake and warning others to prevent them from doing so.
My personal options and choices are:
6 gallon buckets with mylar bags and gamma seal lids for dried beans, rice, pasta, and mashed potato flakes, along with the same buckets for sugar,
salt, and flour, dried butter powder,, coffee, and powdered eggs. (I use colored lids and labels to easily identify what holds what).
Regular sized cans of canned goods (many folks buy the big bulk ones, but this way, I can better decide what portions to make, and more easily rotate
into normal meals).
Large cans of freeze dried meats and cheese, and dried milk
Home Canned fruits, veggies, and even meats, as they keep way longer than regular cans
I also have 6 gallon buckets for dog and cat food, bird seed, rabbit food, and keep sealed bags of horse feed...though I don't (can't really) keep
more than a couple month's supply of these. If a longer ordeal, I'd have to either hope to have enough warning to buy more, or have to forage for
more. I try and keep a lot of hay too, but that fluctuates on us getting a good deal from a farmer.
Of course, the best option is a project we're starting this year...our survival garden, and our own home canning (currently, anything we have we've
got from trusted others)...along with storing seeds and other supplies to sustain a garden.