50 Packs 500CC Food Grade Oxygen Absorbers （10 Packs in Individual Vacuum Bag, 5x Packs of 10), Oxygen Absorbers For Long Term Food Storage, with Oxygen Indicator, for Mylar Bags, Mason Jars

Just got a freeze dryer, and these are a must for long term food storage,

These are a staple in my kitchen. I use oxygen absorbers for preserving my herbs and spices. The seal is perfect, the size is perfect for jars of all sizes. The quality is 100% they are easy to use, for keeping the freshness of your spices. The durability is unmatched

For quality,& quantity at excellent price.

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I stick with U.S. suppliers (even if they are perhaps made overseas), or brands that I know and have used for years (whether domestic or abroad) when it comes to food preservation. For unknown brands, I have plenty of other uses for oxygen absorbers that aren't food related (I vacuum seal other items, which I won't name, with the expectation that by doing so and storing them in a metal airtight container, humidity and oxygen won't derogate the brass...if you know what I mean, you know what I mean). The problem that I have when using them in this manner is that by vacuum sealing, it already makes it pretty air-tight inside the bag. Adding oxygen absorber(s) is merely to capture any potentially residual oxygen remaining, but doesn't otherwise "show" any further tightness inside the bag, etc. As such, I have to assume (and hope) that these are working as intended. I can say that even if not the full 500cc, anything to get rid of trace amounts of oxygen still inside the bag is better than nothing.