If you've got FreshUS 300cc Oxygen Absorbers and they're not making your Mylar bags look like a tight vacuum seal, don't stress.
That's pretty much how they're intended to work. They're designed to remove oxygen (O2) specifically, not the entire mix of air in the packaging. The air we breathe is only about 21% oxygen, and the rest is mostly nitrogen and other gases that don't spoil food. So, the bags might not look vacuum-sealed because the other gases are still there.
Our research shows that many people have pointed out that even if the bags don’t appear vacuum-sealed, these absorbers are doing their job. Some mention things like, "the absorbers did exactly what they were supposed to do—got rid of the oxygen in the bag."
The manufacturer also notes that they work well in different setups, like mason jars, vacuum bags, and vacuum bags for long-term food storage.
The way these absorbers work is pretty interesting. They use iron powder to react with and remove oxygen, forming iron oxide in the process. They come with an oxygen indicator, which is really helpful. It should be pink when the absorbers are in good shape. If it turns blue, that's your cue that they're compromised, and you'll probably want to replace them.
Just make sure your packaging is sealed up properly and that you're using the right number of absorbers for the amount of food you're storing.
This helps create the best environment to keep your food fresh over time. So even if you don’t notice a super tight seal, these absorbers are still working to preserve your food by getting rid of the oxygen.
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How we researched this
Where this comes from: this answer draws on the product's published specifications and the reviews ShopSavvy collected for it, alongside prices from 1 retailer in ShopSavvy's price data, most recently seen Oct 5, 2024.
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