First, did you intend to post in the Knitting forum?

Vacuum sealing will extend shelf life on those items. The heat necessary for oven canning would be detrimental. Flour has a fairly limited shelf life, regardless, because of the oils present. You would be better off with whole grains if you want longer-term storage.

Also........it is best to freeze any flours that will not be used in the near future.
This stabilizes the oils.