“MDG; I hope you have a climate controlled storage room for your flour and/or sift it before use, otherwise you might have an infestation problem leading to יציאת שכרך בהפסדתך.”
I like to freeze it first. Sometimes I put dry ice in the box to remove the oxygen.
“There are national brands of flour available all over that are Yoshon year round. No need to stock up like that.”
I have a particular brand that I prefer.