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Flour Storage Best With Mylar Bags

Reader Question: I am interested in Mylar bags. My question is if we could store flour because I know the flour goes bad in 6 months to a year. Another thing I want to know, I don’t have any food grade buckets so could I store it in can buckets? Or could I store the food in the Mylar bags and leave them in the basement without any buckets?

What is the storage life of flour?

All-purpose flour (white) in cabinet storage will have a shelf life up to 8 months if properly stored in a sealed container or if tightly wrapped, and for refrigerator storage, up to one year.

Freshly ground whole wheat flour, if stored at room temperature with plenty of access to oxygen will, after a few weeks or months, goes rancid.  That rancidity is caused by the oxidation and breakdown of the oils in the wheat. Any flour milled from whole grains contains the germs. These are rich in oils (which is one of the benefits of freshly ground flour) and are prone to oxidation or – more commonly – going rancid. Depending on a few factors you can expect a storage life of 4 to 6 weeks.

Don’t try to store unprotected flours longer than a year. Hermetically sealed (for example: Mylar bag) in the absence of oxygen, plan on a storage life of 5 years at a stable temperature of 70 degrees F. They should keep proportionately longer if stored at cooler temperatures.

For optimum shelf life of flour, procure and store the whole grain itself (wheat berries) and do not grind the flour until you need it. Of course you will need a grain mill for this. Whole grain does not lose nutritional value in storage, whereas once ground into flour, the nutrient level begins to drop dramatically. Whole grains will store for decades in an oxygen free environment.

Mylar bags

Use Mylar bags and oxygen absorbers for an oxygen free environment. Air contains about 78% nitrogen and 21% oxygen, leaving about 1% for the other gasses. If the oxygen is absorbed (with the oxygen absorbers in a sealed Mylar bag), what remains is 99% pure nitrogen in a partial vacuum. Perfect for long term food storage.

Mylar bags do not need to be stored in food-grade buckets. The Mylar bags themselves are the barrier between the food and the outside environment, so long as they are sealed. You could leave the Mylar bags in the basement with no buckets, however I would not put them directly on a concrete floor (use a board or shelves) to avoid the potential of condensation due to the temperature difference between the cold floor and the air (even though most of the air is removed – it’s still a risk). Also, a bucket will serve as protection from the bag becoming punctured, especially from curious rodents.

Note that any sealable bag will work (seal-a-meal type vacuum sealer machines), as long as it holds a vacuum.

How To Seal A Mylar Bag

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17 Comments

  1. we’ve bought enriched white flour from augason farms via costco before and have had good luck. the buckets are crazy hard to get into. we are on our 2nd of 4 buckets. otherwise, we are stockpiling canned wheat from a mormon cannery for super long-term.

  2. I also put Flour in mylar and didn’t know that you weren’t suppose to use self rising. Mine has been kept fairly cool so I feel confident that it’s still okay. How long do you think it will keep if it is kept cool?

    1. @Thelma, I found this information:

      Baking powder has an indefinite shelf life when kept free of moisture and contamination. Baking powder has a best-if-used-by date of 18-24 months. A BYU study examined the leavening power of baking powders stored for up to 29 years in their original cans. All samples successfully leavened biscuits and demonstrated carbon dioxide evolution in lab experiments. Once opened, baking powder will last for approximately six months. To test opened baking powder, mix 1 tsp. in 1/3 cup warm water. If bubbles form, there is activity left in the baking powder.

      Since self rising flour contains baking soda, my interpretation is that the baking soda would lose its effectiveness over a 6-month period in a normal environment. However if the flour/baking-powder mixture is stored in sealed mylar bags in an oxygen-free and dry environment (flour is dry), then I believe you may be Okay. This seems reasonable because ‘they’ say that baking powder will last years or indefinitely if sealed in its original container.

      By the way, the recipe for self rising flour is…
      1 cup all-purpose flour
      1/2 teaspoon salt
      1 1/2 teaspoons baking powder

  3. I have always kept my flour in the freezer, as well as cake mixes,potato chips, and any other dry good sealed. I make delicious pie crust oust of frozen all purpose flour. I have never had a problem. Some has been in th freezer for 2 years! Good luck

  4. I keep self rising flour in Mylar and after about three years or so it won’t brown when used as a coating for frying. I think it has something to do with the oxygen absorbers.

  5. I put my mylar bags filled with the flour in the freezer and I took one out, it was a little moist, but let it come to room temp. is this alright to do?

    1. Sally,
      yes and no,
      usually, flour isnt worth trying to save long term because it doesnt keep real well, most folks store the whole grains, like white wheat or red wheat, they keep indefinitely, the flour is usually only good for a year, maybe two at the most. Just my experience, lots of times if you want to keep the flour from getting buggy, keeping it in the freezer is good, pullit out, measure out what you need, then put it back, I stick the bag of graininthe freezer, 1 week, then bring it out and let it sit for a week, then pack in mylar in a 5 gallon bucket with oxygen absorbers and desiccant packs. Stuff should keep forever about 😎🤙🏻

  6. I’ve got a stash of flour in #10 cans from the LDS store. Runs more or less (depending on if bought in-store or on-line) twice the cost of flour at local grocery store. I figure it breaks pretty close to even compared to purchasing, freezing, packing in mylar with oxygen absorbers, and then into buckets with lids. Convenient. Comes six 4-lb cans in a case.

    1. I’m curious if and what LDS says about their milled flour shelf life sealed in those #10 cans?

      I store wheat (berries) for the long term (lasts decades) and then mill it to flour as needed. Although we do also keep regular ground flour in some bulk quantities too.

      1. Ken, with optimum storage environment – cool and dry – it’s 10 years. But as with any preserved food product YMMV. I also have stacks of their canned wheat berries – 25 year shelf life on those.

  7. I stored organic all purpose flour in Mylar bags with oxygen absorbers and stored them in metal bins approximately 8 months ago. I grabbed one last week- and it was rancid. What did I do wrong? The oxygen absorbers worked and the bags looked vacuum sealed. So disappointing

    1. DEE ,
      It’s possible that mylar bag got a small hole in it somehow. Had that happen with Krusteaz pancake mix. Bought 2 bags at the same time. One was bad but the other was just fine.
      (That company’s customer service was awesome btw!)
      Have you opened another one?
      I would check to see. That bag may just be an anomaly…

  8. I do not know if this question has been asked already, but here goes. Does condensation permeate mylar?

    1. No. However, if the “stuff” inside contains too much moisture, exterior temperature and storage conditions could, in theory, cause some condensation inside. This is not usually a problem with normal “dry goods”.

      Tip: Don’t store the buckets directly on a concrete floor. The cold floor might cause the aforementioned condition, depending… I’ll set them on wood, or anything that will create some amount of minimal insulation between the bucket and a concrete floor. You can also buy some of that hard-pressed insulation foam-board (usually 4×8 sheets) and cut/slice to fit.

      Tip: If you temporarily freeze dry goods such as white-rice first (which destroys any ‘bugs’ or eggs – if they exist in the first place), be absolutely sure that you let it dry out afterwards. Let it come back to room temperature for at least several days before packing.

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