Onyx Stainless Steel Airtight Container
Silicone is only a gasket/seal — what touches your food is Stainless Steel (grade unspecified).
All-stainless container with a stainless lid and a silicone gasket for an airtight seal - steel food contact, no plastic anywhere.
The verdict: Silicone only
Body and lid are stainless steel; the airtight/leak-resistant versions seal with a silicone gasket in the lid. Food touches only steel; the sole non-steel part is the silicone seal. (Plain non-sealing steel tins from Onyx with no gasket are fully plastic-free.)
Verification: Manufacturer confirmed
What it's made of
| Part | Material | Food contact |
|---|---|---|
| container body stainless steel; specific grade not stated by Onyx | Stainless Steel grade unspecified | Yes primary |
| lid stainless steel; specific grade not stated by Onyx | Stainless Steel grade unspecified | Yes primary |
| gasket (airtight models) silicone sealing ring on leak-resistant/airtight lids; plain tins omit it | Silicone | Yes seal |
Straightforward all-steel storage with a clamp lid. A clean choice for anyone who wants steel rather than glass - lighter and unbreakable - in the airtight, leak-resistant format. Onyx also sells plain lidded tins for dry storage.
Pros
- Steel food contact, no plastic; unbreakable and light
- Airtight versions genuinely leak-resistant
- Dishwasher safe
Cons
- Not microwaveable
- You can't see the contents
Categories: Food Storage Containers
Sources
Every material claim above is backed by these. This is the scattered info we centralized.
- manufacturer https://onyxcontainers.com Onyx describes all-stainless containers with stainless lids; airtight models use a silicone gasket
- review https://plasticdetox.org/articles/best-plastic-free-food-storage-containers.html independent roundup listing Onyx stainless containers as a plastic-free/silicone-sealed food storage option
Spot a mistake or something out of date? Let us know — corrections are how this stays accurate.