(4 pack) Ball 6-Pack Leakproof Plastic Mason Jar Lids - Wide Mouth, One-Piece Reusable Wide Mouth Canning Jar Lids for Meal Prep and Freezer Storage, Fits Ball Wide Mouth Mason Jars

Fits perfect on my ½ gallon Ball canning jars, although I would not use these for high-temp canning. I am using them for pickeled eggs in the fridge. I flip the jars each day and I am into day 4, so mine have spent at least 48 hrs upside down in the fridge without a drop of a leak. I would also use these lids for storage of dry goods like beans, lintils, rice, oatmeal, etc.

They're so much smoother than the metal lids and rings. So for frequent use they're way more agreeable. They're easy on the hand, since the edges are more comfortable for gripping. They're truly leak proof, hold up to daily use, they make the jars better stackable, and they're sleekly attractive. I haven't found a down side. All my storage jars have these lids now. The photo is of our hot cocoa bar. All our “add ins” were in jars with these lids. Daily use by kids no less and they're still going strong.