Weck Jars for Canning: Shapes, Sizes and How They Seal

Every Weck jar uses three separate parts. A glass lid sits on top, a rubber ring sits between the lid and the jar’s rim, and two stainless steel clips hold the lid down during processing. As the jar cools after canning, a vacuum forms inside and pulls the lid down tight against the rubber ring. Once the jar has cooled, you remove the clips; the vacuum alone holds the lid on.

The rubber ring has a small tab. The 746 listing explains that when the tab points downward, the seal is intact. To open a sealed jar, you pull the tab to let air in and the lid lifts off. Because the lid is glass, there is no metal to rust or plastic touching your food, and the rings are replaceable. As with any home canning, follow a tested recipe and processing time for the food and jar size you are using.

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WECK 743 Mold Jar (Weck 743)

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Price and specifications are read from the Amazon product page and can change.

WECK 743 Mold Jar

Best for: Pickles, fruit and yogurt in medium batches

Pros

• 3/4 liter wide mouth
• Dishwasher, microwave and freezer safe
• Glass lid with rubber gasket

Cons

• Listing mentions silicone lids confusingly
• Only two jars

The WECK 743 Mold Jar set includes two 3/4 liter jars. “Mold” is Weck’s name for its straight-sided, wide-mouth shape, which makes filling and scooping easy. The listing gives the jar as about 5 inches wide and 7 inches tall.

The glass is described as thick, sturdy and heat resistant, and the specifications list it as dishwasher, microwave and freezer safe. The set includes clips, glass lids and rubber rings. One wording issue: a feature line mentions “Silicone Lids,” while the rest of the listing and the included components describe glass lids with rubber gaskets, which matches the standard Weck design. Suggested uses include yogurt, juices, pickled vegetables, fruits, jams, jellies, dried beans and spices.

The 743 suits new canners making pickles or fruit in medium batches and anyone who wants versatile fridge jars. For bigger ferments, the 974 holds twice as much.

The WECK Canning Jars 742 Mold Jars set contains two tall mold jars. The title and features describe each as 1/2 liter (500 ml), and they share the thick heat-resistant glass, wide mouth, separate lid, ring and clip system, and dishwasher and microwave safety of the 743. They are listed as BPA free.

The product description does not match the title. It describes a “742 Tulip Jar Set” with 1-liter jars and lists two jars, two glass lids, two rubber rings and four stainless steel clamps. Because the title, features and capacity field all say half-liter mold jars, that is most likely what you receive, but check the product page before ordering.

This size suits jams, yogurt and single-serve portions. For a larger pantry set in a similar tall shape, the four-jar 3/4 liter set gives more capacity. If you prefer even smaller sizes, see our guide to small Weck jars.

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Weck Tulip Jars 1 Liter – Large Sour Dough Starter Jars with Wide Mouth – Suitable for Canning and Storage – 2 with Glass Lids

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Price and specifications are read from the Amazon product page and can change.

Weck Tulip Jars 1 Liter

Best for: Sourdough starter and fermenting

Pros

• 1 liter capacity
• Wide mouth
• Elegant tulip shape

Cons

• Listing dimensions seem small for 1 liter
• Model number unclear

The Weck Tulip Jars 1 Liter set includes two jars with glass lids, rubber rings and stainless steel clips. The tulip shape flares outward at the top, which looks elegant on a table and makes a wide opening for stirring.

The listing aims this jar at sourdough starter, and the description says its large capacity holds plenty of starter. It is BPA free and microwave safe, and the description says dishwasher safe too. Some details do not line up: the description calls it the Weck 745, and the listed dimensions of about 3.9 by 5.75 inches seem small for a 1 liter jar, so treat those numbers with caution.

This set suits bakers keeping a sourdough starter and anyone fermenting small batches. For long-term shelf canning in bulk, the mold jars stack more neatly.

The Weck Canning Jars set of four gives you tall 3/4 liter mold jars for a matching pantry. The capacity is listed as 28.7 fluid ounces, and the jars are BPA free, dishwasher safe and microwave safe.

The description identifies them as Weck 743 mold jars with a wide mouth. The title’s “743ml” appears to mix up the model number with the volume, and the form field says “rectangular with rounded edges,” which does not match a round mold jar. The listing mentions “cork and keep fresh lid” as options in general terms, and the included components field only says “lids,” so confirm whether rings and clips are included.

This set suits new households stocking a pantry with dry goods and anyone who wants four matching canning jars at once.

Best for: Gift jams and small preserves

Pros

• Set of six
• Water bath and pressure canning
• Seal indicator tab on ring
• Made in Germany

Cons

• Small 12.5 oz size

The Weck 746 0.36 Liter Tulip Jar set includes six small tulip jars of 12.5 fluid ounces each. This listing gives the clearest canning details: the jars are suitable for water bath and pressure canning, can be frozen and baked, and are made in Germany. They are listed as BPA, lead, PVC and phthalate free.

The thick glass is designed to withstand boiling, sterilizing and processing again and again, the glass lids avoid rust, and the replaceable rubber ring’s tab shows a good seal when it points down. The wide mouth makes filling easy.

This set suits jam makers and gift-givers who want to hand out small jars of preserves. For larger batches, the 743 or 974 hold more. Our 16 oz Weck jar guide covers a similar size.

Best for: Big ferments like sauerkraut

Pros

• Large 1.5 liter capacity
• Glass lid, ring and two clamps
• Wide mouth for easy cleaning

Cons

• Only one jar
• Avoid sudden temperature changes

The Weck Jar 974 is a single 1.5 liter (54 fluid ounce) cylindrical jar, the largest here. It comes with one rubber gasket, one glass lid and two stainless steel clamps.

It is made of heat-resistant soda lime glass made in Germany and described as crack and shatter resistant. The listing says it is microwave and dishwasher safe and can be used for baking, but warns to avoid sudden temperature changes, which is sound advice for any glass. The wide mouth fits large pieces of vegetables and cleans easily with a brush or sponge.

The 974 suits people making sauerkraut, kimchi or pickles in big batches and anyone who wants a large display jar for oats or pasta. For small gift jars, the 746 set is more practical.