Kitchentoolz 1 Gallon Glass Mason Jar with Airtight Metal Lid

The Extra-Large Jar for Serious Fermenting and Bulk

This is the big one.

The Kitchentoolz 1-gallon jar holds a full 128 ounces of glass and stands about 10 inches tall with a 4-inch wide mouth, which makes it the jar people reach for when they are brewing kombucha or kefir in volume, fermenting a big batch of pickles or sauerkraut, water-glassing eggs, or storing bulk dry goods like flour, legumes, and pasta. Made in the USA from strong clear glass, it keeps your food on inert glass, and the extra-wide opening means you can get a whole hand inside for filling, packing, and cleaning. For anyone who ferments or buys in bulk, a single big glass jar replaces a stack of plastic tubs.

It closes with a twist-on metal lid that seals airtight, simple to use one-handed, which is part of why these oversized jars are so popular for fermentation projects.

True Shift Score: 8.0 / 10

This is our own assessment, not a lab result or a certification.

It scores well as a huge, made-in-USA glass jar that replaces a stack of plastic tubs for fermenting and bulk storage, keeping your food on glass with a convenient one-piece metal lid. It sits below the Ball jars and well below the glass-lid jars on our material-purity scale for one honest reason: the airtight seal comes from a plastisol plastic liner inside the metal lid rather than a thin edge compound, a glass lid, or a silicone gasket. It is BPA-free and the food sits in glass, but that liner is the trade, along with the sheer weight of a full gallon. For big-batch fermenting and bulk storage, it is still a solid choice.

The Honest Tradeoffs

The honest detail for a microplastic-free kitchen is the lid liner, and the manufacturer states it plainly:

1. The airtight seal comes from a plastisol liner, a BPA-free PVC and polyethylene coating, on the inside of the metal lid. That liner is the sealing surface. 

2. It is BPA-free and your food sits in the glass below, but it is a plastic liner rather than a glass or silicone seal, so the lid is the one place plastic enters. 

3. For dry storage the liner barely contacts the food, while for a full jar of liquid or ferment there is more contact at the top. 

4. If you want zero plastic at the seal, an all-glass or glass-lid jar is the alternative. 

5. Beyond that, the metal lid should be hand washed even though the glass is dishwasher safe, and a full gallon of glass is genuinely heavy and breakable, so it wants a stable, low spot rather than a high shelf.

How We Evaluate Food Storage

We look at four things, and none is a lab score:

1. Whether the food-contact surface is inert and won't leach

2. Stain, or hold odors, what the lid is actually made of, since that is where plastic hides in most "glass" storage

3. How well it seals and holds up across the fridge, freezer, microwave, and dishwasher, 

4. And how durable it is over years of use. 

The real shift in food storage is getting your food off plastic and onto glass.