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Mason Jar Adapters

Mason jars make great food-storage containers, but the traditional lid offers limited functionality. We tested two products that promise to make mason jars more versatile.

What We Learned

From Brooklyn to Boise, Mason jars are being reused as everything from drinking cups to travel food-storage containers. But the traditional lid offers limited functionality.

We tested one product that promised to turn a jar into a to-go container: a 6-ounce plastic tub that drops inside a widemouthed jar but stays aloft thanks to a wide, flat rim. It turned jars 1 pint or larger ...