Do I use Oxygen Absorbers for re-sealing?

by Linda

When I open a Mylar bag that has already been prepared and sealed with oxygen absorbers to use some of the product, do I need to add a new oxygen absorber every time bag is reopened? As the food is used what strength of absorber should be used if needed?

Hi Linda. The answer depends on how often you are going to use it. If you will be taking some of the product out, say, once a week or once a month, I wouldn't bother with the O2 absorbers. Just roll the top of the Mylar bag down and put the lid back on.

For instance, we have a bucket of oats in our basement storage that we use on a regular basis. It has no Mylar bag - we just poured the oats into the bucket from the paper bag it came in. We don't bother sealing it, other than put the lid on tight, because we use it so often.

If you won't be using it again for years and want to seal it up for longer term storage again, the answer becomes a little more complicated. So stay with me here...

A full 6-gallon bucket of grain or beans has about 1791cc oxygen left inside the container at sea level. (If the bucket contains food such as pasta, it will have more air and need more O2 packs; a powdered food will have less air and need fewer.)

You will need 3-4 of the 500cc oxygen absorbers if you are packing your food at sea level to about 4,000' elevation, and just 2-3 for 4,000' to 7,000' elevations.

Depending on how much product you took out, you might use 1 or 2 fewer O2 packs.

Most oxygen absorber's are significantly overrated for their absorbing capacity - they will absorb more than twice their rated capacity. It is NOT HARMFUL if you use more than what is required.

I hope this answers your question and thanks for asking it. I'm sure others have had the same question.

Click here to post comments

Return to Long Term Food Storage.

Oxygen Absorbers

by Tina Sheehan
(Ijamsvill, Md.)

Oxygen Absorbers

Oxygen Absorbers

I recently purchased oxygen absorbers in bags of 50 with a notice on the package saying that once the package had been opened, all oxygen absorbers had to be used within 15 minutes or replaced in a vacuum sealed bag again, otherwise, they lose their oxygen absorbing properties after 15 minutes. My question is, what do I do with the ones I don't use immediately if I have no means to vacuum seal the package?


Unfortunately, if they're not used within approximately 15 minutes or heat sealed back into their own bag or vacuum sealed in a heat sealed bag (Ziplock bags won't work), they will no longer absorb oxygen.

Comments for Oxygen Absorbers

Click here to add your own comments

Oxygen absorbers
by: Red Woman

You can put them in a small canning jar with a lid. They will absorb the oxygen in the jar, so be sure to use the smallest jar they will all fit in even if you have to smash them a bit :)

by: Mikki

I buy buckets and food. I do not put items in the buckets until I can fill each one. When I have enough, I count how many oxygen absorbers I will need. I do the buckets all at once so as not to waste them.

Oxygen Absorbers

Great suggestions, Mikki and Redwoman!

Thank You!!!
by: Autumn-Raine

Oh my gosh, you all just saved me from making a huge mistake! I just got my first o2 absorbers and I used a few of them and then put them into a ziplock bag. If I hadn't seen your comments, I could have lost almost 80 of them. I just heat-sealed them back into their original bag. Thank you, thank you, thank you! Oh, I'm so grateful you posted this.

Oxygen absorbers
by: TC

You can order oxygen absorbers from Amazon in which they come in vacuum packed pouches with only 5 in each pouch in strips of 20 absorbers so you can open just what you need. If you bend the absorber packet and it feels hard inside it is not any good and should not be used. The Model No. is S-300E (300cc)

The 300 cc size is for 1 gallon mylar bags.

I cooked the damn oxygen bag in my breakfast bag
by: Richard

lol I got a survival breakfast thing yesterday and I wanted to try it before I buy 50+ bags but I poured the boiling water in it and it cooked but I opened it up and I forgot to take out that oxygen bag out! Is it still good? The bag didn't open.

LOL! Cooked the O2 bag
by: Joan

That is worth a big chuckle and I'm sure many have done the same thing. As long as the bag didn't open, I see no danger in eating the food.

Click here to add your own comments

Return to Long Term Food Storage.

Tea Bags & Oxygen Absorbers

Can I dry can tea bags with oxygen absorbers?


Yes, you can. It would be best if you put the tea bags into the freezer for several days. They can get weevils, which means they already have weevil eggs in them. This has happened to some tea I kept in my pantry for months. Putting them in the freezer will kill the eggs. After taking out of the freezer let them sit until they're room temperature, then put in containers with O2 absorbers.

Click here to post comments

Return to Long Term Food Storage.

Dry Pack for Long Term Storage

by Katherin
(United States)

I have a lot of glass canning jars and would like to dry pack for long term storage. I can't find a good list of items only those that say moisture content under 10%. Problem is how do you tell moisture content? Is there a list out there.


Here is a list I found in researching dry pack food storage:

Approved Products:
- Non-fat dry milk and milk/whey products such as hot cocoa
– bleached or unbleached flour
– soft and hard grains
– grains that are not milled or cracked and do not have an oily seed coat such as white rice, wheat, dry-corn, popcorn, barley etc., oats (quick and regular), dried peas and beans, and dehydrated refried beans, eggless pasta products, dehydrated or freeze-dried food that are dry enough to snap, texturized vegetable protein (TVP), soup mixes (without bouillon), gelatin, cheese powder.

Non-Approved Products: These products will not store well because of their high moisture or oil content:
– milled grains, nuts, brown rice, sesame, pearled barley.

Oxygen absorbers: Should be placed on top of the food before sealing the can (except for granulated sugar)– they protect dry food from oxygenation damage and help preserve product quality. The oxygen absorbers remove oxygen more effectively than vacuum packaging.

Click here to post comments

Return to Long Term Food Storage.

Top of Page ^