I must have misunderstood the question when I posted earlier.
Flour is for more than just bread.
By learning the basics of using it for everything from biscuits to bread to pancakes you will save yourself a lot of money over the long term.
It is basic foodstuff.
When you add a supply of raisins or other dried fruit it gets even better.

I also have a problem with the idea of just piling up a hoard of stuff that never gets used.
I buy flour in 10kg (20 pound) bags and use about a bag every 2 months. I keep one bag that I am using and one ready to replace that one when my flour canisters go empty.

If I had to rely on my pantry for a month I would have enough flour for at least one month on hand and likely enough for three months.

Anyway, flour is a lot easier to store than frozen or canned bread.

(Also, have you ever tried carrying eggs or bread in a pack sack? They seldom survive in a useful form.)

edit:
I also would point out that most bakeries have a two day delivery schedule, and stores only stock that much bread. If the power goes out bread bakeries shut and stores run out of bread fast.