Weck Mold Jar 743 with Glass Lid (3/4 Liter)
Weck
Mold Jar 743 with Glass Lid, Rubber Ring, and Steel Clamps (3/4 liter)
Glass, glass, natural rubber, steel. Verified fully plastic-free from Weck primary sources; the benchmark closure for plastic-free food preservation.
The German canning classic: a thick glass jar sealed by a glass lid, a rubber gasket, and stainless steel clamps. No plastic anywhere in the closure, which makes it one of the only fully plastic-free canning systems.
How this score breaks down
Strengths
- Glass lid instead of a plastic or plastisol-lined metal lid
- Fully repairable system: rings, clips, and lids all sold as spares
- Endlessly reusable and recyclable glass and steel
- Century-old design with no plastic era compromises
Trade-offs
- Natural rubber rings stretch if exposed to oils and need occasional replacement (cheap and sold in bags)
- Glass lids can chip if dropped; spare parts fix it
- Sold on Amazon via a third-party reseller
Scored on our durable-goods method (durables-v1, 2026-07-03). How we rank →
What's inside
Thick tempered glass jar and glass lid, sealed with a natural rubber gasket and stainless steel clamps. Weck confirms on its own site that the rings are made of natural rubber. BPA-free, dishwasher and microwave safe glass per the listing.
Free of Plastic lid, plastic seal, plastic clamp
- Packaging
- Not stated
- Microplastics
- None expected. Food touches glass and the rubber gasket only; the closure contains no plastic parts.
Attributes
What this product is, at a glance.
Certifications
None listed. We only show independent third-party certifications we can verify with the issuing body, and this product does not currently hold any.
About Weck
Weck has made home-canning glass in Germany for over a century, and its glass-lid-and-rubber-ring system predates the plastic era entirely. The 743 mold jar is the versatile 3/4 liter workhorse of the range.
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