Grosmimi PPSU Straw Cup
A performance-favorite Korean straw cup parents love for its soft silicone straw and leak-proof seal - but the cup body and lid are PPSU plastic, so the drink still sits in a plastic vessel.
The verdict: Minimal plastic contact
Grosmimi's famous straw cup is a value-and-performance favorite - babies take to the soft silicone straw easily and the PureSeal valve genuinely doesn't leak. But materials-wise the cup body and lid are PPSU (a high-heat medical-grade plastic), with a silicone straw and a silicone sealing valve. So the drink lives in a plastic vessel and the child sips through silicone: minimal-contact, not silicone-only. PPSU is a more heat-stable plastic than PP, but it's still plastic in the drink path. Grosmimi's stainless-steel straw cup (304 outer / 316 inner) is the version that keeps the drink off plastic.
Verification: Manufacturer confirmed · Last reviewed
What it's made of
| Part | Material | Food contact |
|---|---|---|
| cup body PPSU (polyphenylsulfone), a high-heat medical-grade plastic; no dedicated PPSU material slug, using plastic-other | Plastic other / unspecified | Yes primary |
| lid PPSU lid housing the straw and valve | Plastic other / unspecified | Yes incidental |
| straw soft platinum-silicone straw the child drinks through | Silicone | Yes primary |
| sealing valve silicone valve in the PureSeal system (paired with a weighted stainless ball) | Silicone | Yes incidental |
The Grosmimi straw cup is one of the most-recommended value picks in toddler drinkware: parents report babies switch to the soft silicone straw with little fuss, and the weighted-ball PureSeal valve holds a genuine no-leak seal in any orientation. It comes in 200ml (6oz) and 300ml (10oz), with side handles and a flip-top lid. If you want the same straw experience without the plastic vessel, the brand's stainless-steel straw cup (304/316 steel body, same silicone straw) is the swap.
Pros
- Soft silicone straw babies take to easily; excellent leak-proof PureSeal valve
- PPSU is heat-stable and stands up to repeated sterilizing better than PP
- The performance/value favorite many parents recommend first
Cons
- Cup body and lid are PPSU plastic - the drink sits in a plastic vessel
- Silicone straws need replacing every couple of months
- For a non-plastic vessel you have to step up to Grosmimi's stainless version
Notes
- Silicone straws and valves are replaceable parts
Categories: Sippy Cups & Toddler Cups
Sources
Every material claim above is backed by these. This is the scattered info we centralized.
- manufacturer https://grosmimi.us/ Grosmimi makes PPSU straw cups with silicone straws and a PureSeal weighted-ball/silicone-valve system; also offers 304/316 stainless straw cups
- review https://onzenna.com/products/grosmimi-stainless-steel-straw-cup-with-flip-top-10oz-300ml retailer confirms the stainless straw cup is 304 outer / 316 inner steel, and the standard straw cup line is PPSU with a silicone straw
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