9 February 2014, 17:33
I have used 5-year-old "all-purpose" flour in which the paper bags were placed inside a plastic bag which was then vacuum-sealed, with an oxygen absorber placed inside the package between the original paper bag and the vacuum-sealed over wrap. I have also used paper bagged flour which was loosely wrapped in a.plastic grocery sack and stored in the freezer for up to 2 years. Longer than that the flour took on a "freezer" odor. Probably safe to use, but not as appetizing.
73 de KE4SKY
In "Almost Heaven" West Virginia
USA