wisedry 300CC [100 Packets, 10 packs of 10] Food Grade Oxygen Absorbers for Long Term Food Storage, Keep Food Fresh O2 Absorbers Packets for Wheat Oats Flour and Freeze Dried Foods

Dropped into a nearly heat closed Mylar bag full of dried mashed potatoes then sealed all the way. In a few minutes, the absorbers eliminated the oxygen and a vacuum was created, just as advertised. What was not used, I put in a quart canning jar with a pressure lid and screw lid and some leaking absorber vacuum seale the jar. Hopefully, when I do another long term sealing project, they’ll still be active.

Excellent product

work great

Ok, after reading some of the negative reviews, I feel I have to clear something up. A few people have mentioned that they don’t think the oxygen absorbers are working, because there is no visible sign of their container contracting due to loss of air. This is not how things work. Remember, it is the OXYGEN that is being removed, not the AIR. Oxygen makes up around 21% of air, so your container is not going to behave as if a vacuum has formed within.However, it is important to note that the process of removing the oxygen generates heat within the packets, and this will allow some of the water vapor present in the air within your container to condense. That is why it is important you use a desiccant along with an oxygen absorber.Remember, not all food can be stored with an oxygen absorber. As a general rule, foods with moisture content should never be stored with an oxygen absorber, as there is a very serious risk from dangerous bacteria (botulism). If you are in doubt, do research online.

These work very well. They're made from metal shavings. I've bought other OAs made from other materials and they don't last well, even when stored in a vacuum sealed jar.