Le Parfait
Wire-bail glass jar with a natural rubber gasket — pantry storage and fermenting with glass, rubber and steel, and no plastic seal at all.
$$$Our price tier
Weck
742 Mold Jar Glass Storage Jar (Set of 6)
Plasticproof Excellent $$$Our price tier
German jar system with a glass lid, a natural rubber ring and steel clamps — the food touches glass on every surface, top included.
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See exactly how we verify this
Glass lid, not lined metalGlass on every food surface.
Rubber ring seals itReplaceable, inexpensive.
No coating anywhereNothing to scratch or corrode.
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Why it's safe for your family
- The lid is glass. That is the difference from almost every other jar: even good preserving jars use a metal lid with a plastic-based liner, so the surface directly above your food is coated. Here it is glass on glass, sealed by a rubber ring at the rim.
- The natural rubber ring is the only non-glass part in contact, and it is replaceable and inexpensive.
- Steel clamps hold the lid rather than a screw thread, so nothing corrodes into the food and there is no coating to scratch.
- The tapered mold shape empties cleanly, which is the practical reason these jars get used for anything set or layered rather than only looking good on a shelf.
Quick specs
Body
Glass
Lid
Glass
Seal
Natural rubber ring
Closure
Stainless steel clamps
Plastic
None
What to avoid instead
Avoid metal-lidded jars for long storage of oily or acidic food, where the coated underside of the lid sits directly over the contents. As with any bail-style jar, follow tested canning guidance rather than assuming a seal is shelf-stable.
How we verify — and what we don't
Straight answer: we're a research team, not a testing lab. Here's exactly what our rating is based on — and what it isn't — so you can weigh it honestly.
What we check
- What the product is made of, from the maker's own specs and product listing.
- Whether any part that touches you or your food uses PTFE, PFAS, plastic, or a coating that can degrade.
- Peer-reviewed research on how that material behaves when heated, scratched, washed, or worn.
- Known failure modes — how the product actually breaks down in a real home.
What we don't do
- We have not chemically tested this specific unit in a lab.
- We don't take payment to rate a product higher — there is no sponsored placement.
- We don't show star ratings or "trusted by thousands" counts we can't stand behind.
What gets a product rejected
Anything that adds a known microplastic, PFAS, or off-gassing source — a non-stick coating, a plastic surface against food or skin, vinyl/PVC — is downgraded or cut. We only list what clears that bar.
Don't take our word for it — check the sources yourself Weck's product details
Common questions
How do I know the seal took?
The tab on the rubber ring points down when a jar has sealed under vacuum, and lifting a clamp on a properly sealed jar will not open it. That visual tell is the reason this system is popular with people who preserve seriously.
Are the rings reusable?
Yes, for a while — they are natural rubber and they harden with heat cycles. Replace a ring that has lost its spring rather than trusting it; they cost very little and are the only consumable in the system.
Is a glass lid fragile?
It is glass, so treat it as glass: no dropping onto a hard counter, no prying with a knife. In exchange you get a jar where nothing coated ever sits over your food, which is the whole point of the design.
Related reading
Kitchen Plastic Detox Guide
