Bests & Worsts Reviews from Amazon

These lids are just wonderful. They turn any mason jar into a perfect food storage container, they're easy to twist on and off, top rack dishwasher safe, and very durable. Unlike the metal lids, they obviously won't rust over time, and they are great for fermenting and storing pickles, as the sour and salty pickle brine tends to rust out metal lids very quickly. To the reviewers who complained that these lids are not water-tight, yes, that is true, but there's an easy solution. You know how the regular metal mason jar lids are composed of two parts? There's an outer ring plus a flat metal disc with a rubber seal for use in canning applications. Well, the flat disc with the rubber seal fits PERFECTLY inside these plastic lids. If you need to make your jar water-tight, just put the metal disc with the rubber seal on top of your jar, then screw the plastic lid over it, instead of using the metal ring. Voila! Nothing will leak. Although it would be nice to have a single water-tight cap, I find the discs with the plastic caps are still way more convenient than using the rings that are difficult to clean and rust quickly. I actually like that these plastic lids are not water and air-tight without the metal discs because it makes them more versatile. The fact that the plastic lids breathe works out well for pickling. I can keep the plastic cap on the jar while my pickles are fermenting, and it allows the carbon dioxide to leak out rather than build up and make my jar explode. Then, if I need to travel with the jars, I can just insert the metal disc, and the jars stay perfectly sealed.