
What the product listing won't tell you
Know before you buy
Independent testing found lead in the exterior glass glaze (142-159 ppm) — this is on the outside of the jar, not on food-contact surfaces, but it triggers a California Prop 65 warning that families with young children should be aware of.
Borosilicate glass construction - completely chemically inert, zero coating concerns
Weck
Weck 743 Mold Jar (Set of 4)
Weck
Weck 743 Mold Jar (Set of 4)
$39.99
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California Prop 65 chemical exposure warning - review the specific substance before purchasing for daily family use
Specs the product listing doesn't explain
What your food and family come into contact with every use
What determines how well this performs its core job
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3 criteria - open any layer to see exactly what we found
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$39.99
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Common questions about the Weck 743 Mold Jar (Set of 4)
See how this product stacks up against alternatives

Two strong Food Storage Container options compared. Weck and Caraway both perform well with different strengths, so the right pick depends on your specific priorities.
In this Food Storage Container showdown, Weck takes the lead with a score of 9.7/10 vs Stasher's 7.7/10. Weck excels in overall performance, though Stasher may still be right for specific use cases.

In this Food Storage Container showdown, Weck takes the lead with a score of 9.7/10 vs Snapware's 6.9/10. Weck excels in overall performance, though Snapware may still be right for specific use cases.

In this Food Storage Container showdown, Weck takes the lead with a score of 9.7/10 vs Snapware's 6.9/10. Weck excels in overall performance, though Snapware may still be right for specific use cases.

In this Food Storage Container showdown, Weck takes the lead with a score of 9.7/10 vs Glad's 6.6/10. Weck excels in overall performance, though Glad may still be right for specific use cases.

In this Food Storage Container showdown, Weck takes the lead with a score of 9.7/10 vs Ziploc's 6.6/10. Weck excels in overall performance, though Ziploc may still be right for specific use cases.
The Weck 743 Mold Jar (Set of 4) was graded against the same food storage container-specific rubric we apply to every product in this category — no brand-by-brand exceptions, no sponsored placements, no affiliate-weighted scores. The verdict above came from three pillars: safety (materials, certifications, recall history, chemical exposure pathways), efficacy (independent testing data, verified performance specs, real-world usage durability), and usability (ergonomics, cleaning, noise, parts availability over time). Every point deduction has a citation behind it. Every claim links back to a primary source. Nothing is hidden behind opaque badges.
What separates this from a typical food storage container review elsewhere on the web: we don't accept sponsorships, paid placements, or rev-share-weighted rankings. The brand of the Weck 743 Mold Jar (Set of 4)cannot pay to move up the list. The score is logic-driven (a weighted formula across safety, efficacy, and usability), not opinion-driven, so an editor's personal preference cannot override the evidence. When two products in this category are within a point of each other, the right tie-breaker is whichever pillar matters most to your household — not whichever one ranks first.
A high safety score on the Weck 743 Mold Jar (Set of 4)doesn't automatically mean “buy this.” A food storage containerthat's genuinely safe but loses points on efficacy may still be the wrong fit if performance is what you actually need. Conversely, a food storage containerthat's usability-strong but safety-flagged probably isn't the right call for a child with a known sensitivity. The score is the start of the decision, not the end.
R3 is not a medical, legal, or financial advisor. This review is general consumer-safety reporting, not personalized health guidance. If a safety concern on this page intersects with a specific allergy, sensitivity, or medical condition in your household, talk to your pediatrician or a board-certified specialist — they can weigh the evidence against your family's situation in a way no review can. We'll update this page when credible new evidence changes the picture (a recall, a new lab certification, a meaningful product redesign); the last-updated date in the byline is the source of truth on how current this analysis is.
#1 of 16 food storage containers reviewed
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