Weck
Weck 743 Mold Jar (Set of 6)
Why customers love it: Our 743 ¾ L Mold Jar is popular with making sourdough starters. Customers enjoy the depth and wide opening of the glass for the perfect starter structure which makes it easy to maintain, and that it is the perfect size for storage, crafts or a meal. Customers also like this jar for drinking glasses including coffee and juice, smoothies, salads, food and leftover storage, and larger batch chia pudding and overnight oats. This jar is very popular for meal prepping. Includes(seller description)
Where to buy
Parts & evidence
| Part | Material | State | Evidence |
|---|---|---|---|
| clamps | · | unknown | “clamps - material not stated on listing” brand page ↗ |
| gasket | rubber | silicone | “rubber gasket” brand page ↗ |
| jar body | glass | non-plastic | “high-quality glass jars” brand page ↗ |
| lid | glass | non-plastic | “glass lids” brand page ↗ |
Research on plastic in food storage
Peer-reviewed journals, government agencies, and standards bodies.
“Each food container released approximately 100,000 to 260,000 plastic particles.”
“We found that food containers exposed to high-temperature released more than 10 million microplastics per mL in water.”
NGO guides, independent testing, teardowns, and documented community reports.
“When Fulfer put hot pasta in a black plastic takeout container and followed the same procedure, she again saw microplastics under the microscope. Even more came off the container and leached into the pasta when she microwaved it in the same vessel.”
NBC News · 2025
Quoted verbatim and linked to the source. We make no health claims of our own. Read the sources and judge them yourself.
Seller links may be affiliate links. Disclosure. We state observed evidence, not verdicts. See the scoring rubric.