Glass Storage / Canning Jars
Glass jar, glass lid, natural rubber gasket, stainless clips - a fully plastic-free sealing system with zero metal-to-food contact, ideal for acidic and fermented foods.
Plastic-free verdict: Plastic-free
The whole sealing system avoids plastic: a glass jar, a tempered glass lid, a natural rubber gasket between the glass surfaces, and stainless steel clamps holding it shut. Only glass and rubber touch the food - no plastic and, because the seal is glass-on-glass, no metal either.
Verification: Manufacturer confirmed · reviewed 2026-07-05
What it's made of
| Part | Material | Food contact |
|---|---|---|
| jar | Soda-Lime Glass | Yes |
| lid tempered glass disc | Soda-Lime Glass | Yes |
| sealing ring genuine Weck rings are natural rubber; replaceable | Natural Rubber / Latex | Yes |
| clamps stainless steel clips press the lid down; do not touch food | Stainless Steel (304 / 18-8) | No |
The classic German preserving jar and the cleanest fully plastic-free storage system on the market. Because the seal is a glass lid on a natural rubber ring, nothing metal or plastic touches the contents - a real advantage for acidic ferments, pickles, and jams that would corrode or leach against a metal lid. Works for everyday fridge and pantry storage as well as canning.
Pros
- Fully plastic-free seal (glass + natural rubber + steel clips)
- No metal-to-food contact - excellent for acidic/fermented foods
- Rings and clips are replaceable; jars are reusable indefinitely
Cons
- Multi-part system (jar, lid, ring, two clips) is fiddlier than a screw lid
- Rubber rings wear and need periodic replacement
- Glass is breakable
Categories: Food Storage Containers
Sources
Every material claim above is backed by these. This is the scattered info we centralized.
- manufacturer https://weckjars.com/faq/ Weck describes the glass lid + rubber ring + stainless clamp sealing system with no metal-to-food contact
- review https://wellwhisk.com/best-glass-jars/ independent confirmation that genuine Weck rings are natural rubber and the system is plastic-free