ECOlunchbox Seal Cup Mini, 304 Stainless with Silicone Lid
ECOlunchbox
Seal Cup Mini
The plastic-free swap for snack bags and small plastic tubs. Dishwasher and oven safe, not for microwaves.
A leak-proof type 304 stainless cup with a snap-on food-grade silicone lid, no plastic anywhere in the food path. The silicone cure system is undisclosed, which is what holds it at 2 on our silicone ladder.
How this score breaks down
Strengths
- 304 stainless food path
- Leak-proof snap lid
- Dishwasher and oven safe
- Sizes up to Jumbo share the design
Trade-offs
- Silicone cure system undisclosed
- Not microwave safe
- Packaging not stated
Scored on our durable-goods method (durables-v1, 2026-07-12). How we rank →
What's inside
Type 304 stainless steel cup with a lid the brand describes as pure food-grade silicone meeting FDA and NSF testing requirements. The lid is the seal; there is no separate gasket.
| Part | Material |
|---|---|
| Cup | Type 304 stainless steel |
| Lid | Food-grade silicone, cure system not disclosed |
Free of Free of BPA, BPS, and phthalates per brand
- Packaging
- Not stated
- Microplastics
- Silicone is not a petroleum plastic and is not a microplastic source the way plastic is, though as a polymer it can release trace particles or siloxanes, more so with heat and age. Whether silicone forms microplastics is still an open question.
Attributes
What this product is, at a glance.
Certifications
None listed. We only show independent third-party certifications we can verify with the issuing body, and this product does not currently hold any.
About ECOlunchbox
ECOlunchbox’s Blue Water Bento line is made in China from food-grade 304 stainless with 100% silicone lids, per the brand’s own FAQ. The Seal Cup Mini holds 3 oz, and larger sizes share the same construction.
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