Round Container with Silicone Lid
A 304 stainless container sealed by a platinum-grade silicone lid - leak-resistant with zero plastic; the only non-steel part is the silicone lid.
Plastic-free verdict: Silicone only
The container is 304 (18/8) stainless steel, and the leak-resistant lid is platinum-grade silicone - the only non-steel part, and the reason it's silicone-only rather than fully plastic-free. Unlike gasketed steel boxes (where a plastic frame holds a silicone ring), the whole lid here is a single piece of silicone that stretches over the steel rim, so there's no plastic anywhere. This is the practical pick when you need a seal for wet foods and still want to avoid plastic - the flexible lid is easy for kids' hands.
Verification: Manufacturer confirmed · reviewed 2026-07-05
What it's made of
| Part | Material | Food contact |
|---|---|---|
| container body 304 (18/8) stainless steel; no liner or coating | Stainless Steel (304 / 18-8) | Yes |
| lid one-piece platinum-grade food-grade silicone stretch lid; no plastic frame, provides the leak-resistant seal | Silicone | Yes |
A round nesting food container built from 304 stainless steel with a platinum-grade silicone lid that stretches over the rim for a leak-resistant seal. It's the counterpoint to gasket-free steel boxes: where those stay 100% plastic-free by skipping the seal (and leaking), this keeps things plastic-free by making the entire lid one piece of silicone rather than a plastic-framed lid with a silicone ring. Sold in nesting sizes (roughly 5/9/16oz) that pack down, and the flexible lid is easy for small hands - which is why U-Konserve markets these for kids' lunches (the brand was formerly "Kids Konserve").
Pros
- Body is 304 stainless, lid is one-piece silicone - no plastic anywhere
- Silicone lid gives a real leak-resistant seal for wet foods
- Flexible lid is easy for kids to open and close
- Nesting sizes; dishwasher, freezer, and oven-safe (lid off)
Cons
- Silicone lid keeps it from a fully plastic-free rating
- Silicone lids can loosen with wear and eventually need replacing
- Steel body can't go in the microwave
- Round shape is less space-efficient than a bento tray
Notes
- Formerly branded "Kids Konserve"; also sold as square to-go and bento formats with the same silicone-lid design
- Silicone lid is a single piece (no plastic frame), distinguishing it from many "leak-proof" boxes
Categories: Lunch Boxes · Food Storage Containers
Sources
Every material claim above is backed by these. This is the scattered info we centralized.
- manufacturer https://ukonserve.com/products/round-stainless-steel-container-with-silicone-lid brand states container is 304 (18/8) stainless steel and lid is plastic-free platinum-grade silicone; free of BPA/BPS/phthalates/lead
- manufacturer https://www.amazon.com/Konserve-Container-Clear-Silicone-Medium/dp/B088VWM76W U-Konserve listing confirms stainless steel body with leak-proof silicone lid, dishwasher safe, plastic free