well I decided to try and vacuum seal my flour to see if how many years it will last.
using mylar bags and a vacuum sealer, Iwas able to get a nice sealed brick like seal on it, I also patted the bag as it was sealing to condense it. from what I have read this should give me 4-5 years of shelf life.
*vacuum sealer tips that really help
1. use a small strip of the plastic vacuum sealer bags that is textured inside the mylar or the vacuum will not suck out the air, the mylar, it is to slick.
2. make sure to run the strip to all the way to the food item or the mylar will suck to itself and not get a good vacuum.
3. carefully place the plastic strip 1/4 inch below the lip of the mylar bag so you can use an iron and still seal mylar to mylar at the top of the bag.
here is my vacuum sealed flour