Weck 741 - 0.25 Liter Mold Jars with Lids - 6 Rings and 12 C

The Verdict

If you’ve been eyeing those iconic glass jars with the wire clips and rubber gaskets, you’ve probably landed on the Weck 741. This is the 0.25-liter (about 8.5 ounces) version of the German classic, sold here as a set of six jars with six glass lids, six rubber rings, and twelve stainless steel clips — enough to run a full canning batch or organize your entire spice drawer.

What’s Actually in the Box

The Weck 741 set gives you six complete jar units: the molded glass jar itself, a glass lid, a rubber sealing ring, and two clips per jar. The glass is noticeably thick and heavy for its size — this isn’t cheap soda-lime glass. It’s borosilicate, which means it tolerates dramatic temperature swings without cracking. You can technically put these in the oven (up to 180°C/350°F), microwave, freezer, and dishwasher, though the rubber rings should come off before any high-heat use.

The 0.25L size is smaller than it looks in photos. To visualize: it holds about one cup of liquid. Perfect for single servings of yogurt, individual jams, or storing small dry goods like chia seeds, spices, or loose-leaf tea.

Real-World Performance

I tested these for both canning and everyday storage. The sealing mechanism is straightforward: place the rubber ring on the jar rim, set the glass lid on top, then flip the two clips up to lock it down. For canning, the rubber ring creates an airtight seal as the jar cools — you’ll hear the satisfying “pop” as the vacuum forms. One buyer noted, “I’ve made three batches of jam with these and every single lid sealed perfectly. No failures.”

The wide mouth is the standout feature here. At 70mm across, you can get a spoon or spatula in easily, and cleaning is a breeze — no narrow necks trapping residue. The glass is also completely non-porous, so no staining or odor retention after garlic-heavy pickles.

Where Buyers Consistently Praise

Across the 225 ratings, the recurring theme is build quality and reliability. Another verified purchase commented: “These are my go-to for sourdough starter discard and overnight oats. The glass is thick, the seal is solid, and they stack beautifully in the fridge.” The aesthetic also gets consistent love — the jars look expensive on a shelf, and the glass clarity stays pristine even after dozens of dishwasher cycles.

Honest Downsides

The rubber rings are the weak point. For canning, Weck recommends using fresh rings each batch — they’re cheap (about $6 for a pack of 10), but it’s an ongoing cost and a hassle if you’re mid-project and run out. The clips also require a bit of practice; they’re spring-loaded and can shoot off when you’re releasing the seal on a hot jar. I nearly lost one down the garbage disposal on my first try.

Also, don’t expect measuring marks or a pouring spout. These are straight-sided jars, and liquid pours drip down the edge without a spout. If you’re using them for dressings or syrups, decant first.

Who Should Buy These

• Home canners doing small-batch jams, jellies, or pickles — the 0.25L size is ideal for gifts or testing recipes
• Meal-preppers who want single-serving yogurt, chia pudding, or overnight oats in a non-plastic container
• Organizers who want uniform, attractive jars for spices, herbs, or bathroom storage (cotton balls, bath salts)

Skip these if you need large-capacity canning jars (this set equals just 1.5 liters total) or if you want something you can toss in the microwave without removing the lid — the glass lid and ring should come off first.

FAQ

Can these go in a pressure canner? No. Weck recommends these for water-bath canning only (high-acid foods like jams and pickles). The glass can handle heat, but the clamping system isn’t designed for pressure canning’s high PSI.

Are the replacement parts easy to find? Yes — Weck sells replacement rings, lids, and clips separately on Amazon. The 0.25L size uses size 70mm rings and standard clips, all of which are widely stocked.

Do they leak if stored on their side? The rubber seal holds liquids when properly sealed, but I wouldn’t trust them sideways for long-term storage. The seal is designed for upright use; laying them down increases leak risk if the ring isn’t perfectly seated.

The Verdict

Rating: 4.6/5

Buy it if you want a versatile, beautifully-made small jar that handles canning, storage, and meal prep with equal grace. The borosilicate glass and interchangeable parts make this a long-term investment, not a disposable container.

Skip it if you’re on a tight budget — the upfront cost plus replacement rings adds up — or if you need larger capacity. For 0.25L jars, there are cheaper options, but few match Weck’s durability and seal reliability. For small-batch canning and everyday kitchen organization, this set earns its keep.

Where to Buy

👉 Check Price on Amazon →

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Last updated: 2026-08-06. Ratings and prices current as of review date. Verify on Amazon before purchasing.