Glass Fermentation Weights for Fermenting in Wide Mouth Mason Jars


These heavy, tempered glass weights perfectly fit into a wide mouth Mason jar to hold your fermenting vegetables under the brine and press out any air pockets, leaving a tiny space around the edges to let out fermentation gasses.

Glass weights that are not tempered often crack in half during fermentation.

We decided these weights chipped too easily at the sharp polished edge, so we are now hand sanding each weight before sending them out. This is extremely time consuming and expensive, but we didn't want to risk glass chips ending up in your ferments!

The highest quality fermentation weights you can buy anywhere!

Fermentation weights cannot be shipped internationally – they are too heavy and expensive to ship.

Select one of the variations by clicking a picture just below this text before clicking add to cart.

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Product Description

These weights were designed to be the very best on the market for fermenting in wide mouth Mason jars. They are 68.5mm (2.7 inches) in diameter and 18.5mm (.73 inches) thick. They weigh 6 ounces each (170 grams).

The weights are cut from sheets of high quality tempered soda-lime glass, the same material Mason jars themselves are made of. Most competing discs are not tempered, which is much cheaper to produce but less safe. Air bubbles and other imperfections in lower quality glass can cause it to crack, break, or chip.

If you fill your jars up to the neck, one weight will perfectly cover your ferment. You can use more than one weight if the jar isn’t completely full or if you want to displace more brine to bring the level up to the neck of the jar. With more active ferments, you might not want to fill the jar into the neck to avoid overflowing brine. Then you will probably want to use two weights.

Glass does not leach anything into your food.

Dishwasher safe, boiling water safe, oven safe, microwave safe. Avoid sudden temperature changes.

Additional information


Single Weight, Six Pack of Sanded Weights, Six Pack of Unsanded Weights

5.00 out of 5

reviews for Glass Fermentation Weights for Fermenting in Wide Mouth Mason Jars

  1. Rated 5 out of 5

    Kelsang T

    These are an excellent addition to the home fermenting kit, keeping food submerged and preventing you from having to add so much liquid that it overflows. A good weight and very easy to work with.

  2. Rated 5 out of 5

    Jacque (verified owner)

    Recently made a fermented vegetable salad of coarsely chopped cabbage, sweet onion and sweet red pepper. I used 2 of these weights and a Ball wide mouth quart jar. When it was finished I used one of the silicone seals inside of a plastic Ball lid to store it in the fridge. These are very convenient additions to my kitchen.

  3. Rated 5 out of 5

    Margery Anderson

    When I first fermented small batch veggies, I thought these weights were too expensive. After trying other methods to keep the veggies in the brine (cabbage leaf, carrot strips, a questionable piece of plastic), I decided these were a good buy. They are better than expected! They are heavy enough to compress the veggies well below the brine or pickling juice; they are wide enough to prevent stragglers finding their way around the edge; they are narrow enough to allow fermentation gases to escape and to lift out of the jar with a fork. I love that they are glass and not leaching anything. I will need some practice lowering them down into the jar so they don’t flip into a vertical position. I’m not graceful with that yet, but have managed to place the weight successfully in any case.
    Photo shows garlic fermenting in honey. Mmmmmm!

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Frequently Bought Together

+Charcoal gray silicone fermentation and straw hole lid with stainless steel band for wide mouth Mason jars+3 piece airlock for fermenting in Mason jars
Price for all three:   $13.97

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