Stainless Steel Tumbler
GrosmimiGrosmimi Stainless Steel Kids Tumbler - 10oz (18 Months+)
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Free shipping on orders $50+ · Ships in 1-3 business days
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About This Item
- The Grosmimi Stainless Steel Kids Tumbler (10oz / 300ml) is designed for little hands and big adventures
- Silicone Drinking Tip Gentle on gums and teeth, the BPA-free silicone tip makes sipping easy and safe
- One-Touch Cap with Lock A one-touch flip design that prevents leaks when closed, making it perfect for on-the-go use
- Hand Strap Included Comes with a sturdy strap so kids can carry it independently—great for school and travel
- Easy to Clean Fully detachable parts (silicone tip, ring, cap, and more) make cleaning and sanitization simple
Why Grosmimi?
6 reasons parents choose this cup
Stainless Steel Body
SUS 304/316 stainless steel keeps drinks at the right temperature. Durable, hygienic, and taste-neutral.
Soft Round Silicone Tip
Gentle flow silicone drinking tip — soft on teeth and gums.
Leak Prevention with Stopper
Built-in stopper prevents leaks. Flip-top locks in place securely.
Convenient Strap
Carry strap lets toddlers take their tumbler to daycare, parks, and outings.
Stable Ergonomic Design
Wide base prevents tipping. Designed for small hands to grip confidently.
Made in Korea
Manufactured by Grosmimi in Korea.
What's Included
Everything in the box
Additional straw teats and accessories are available separately.
Stainless Steel Body
SUS 316 inner, 304 outer
Flip-Top Lid
Locks in place
Silicone Drinking Tip
Soft round, gentle flow
Leak Prevention Stopper
Sealed when closed
Convenient Strap
Carry on the go
Grows With Your Baby
One system, every stage.
Grosmimi's full product line covers every stage — from bottle to straw cup to tumbler. Each product is compatible with the same accessories, so you invest in a system, not throwaway cups.
The Brand
From Grosmimi. Made in Korea.
Grosmimi crafts PPSU feeding products for babies — from bottles to straw cups to tumblers. Made in Korea, trusted by parents worldwide.
Korean Brand Consumer Evaluation 2023
Infant Products Winner — Feeding Bottle & Straw Cup category.
The Material
Why Stainless Steel.
SUS 304 and SUS 316 stainless steel are the same grades used in medical equipment and food processing. They resist corrosion, retain no flavors, and keep drinks at the right temperature for hours — without any plastic touching the liquid.
SUS 304/316
Medical and food-grade stainless steel
BPA Free
No plastic contact with the liquid
🇰🇷
Made in Korea by Grosmimi
What Parents Say
What parents are saying
“My daughter finally drinks water on her own. The weighted straw was the game changer.”
Sarah M.
Baby: 9mo · Verified
“Switched after reading about microplastics. The PPSU difference is real — doesn't discolor after months.”
Jennifer K.
Baby: 14mo · Verified
“We're on our third Grosmimi — 6oz, 10oz, now the tumbler. Best cups ever. Zero leaks.”
David L.
Toddler: 2.5yr · Repeat buyer
Care & Sterilization
How to sterilize each part
| Method | Body (SUS 304) | Cap (PP) | Straw (Silicone) | Accessories |
|---|---|---|---|---|
| Hot Water | ✓ | ✓ | ✓ | ✓ |
| UV Sterilizer | ✓ | ✓ | ✗ | ✓ |
| Dishwasher | ✓ | ✓ | ✗ | ✓ |
| Steam | ✓ | ✓ | ✓ | ✓ |
| Microwave | ✗ | ✗ | ✗ | ✗ |
Tips: Do NOT microwave stainless steel. Replace silicone parts every 2-3 months. Always disassemble all parts before cleaning.
Certifications
Certified safe
BPA Free
No plastic contact with the liquid
SUS 304/316
Medical and food-grade stainless steel
Made in Korea
Manufactured by Grosmimi in Korea
Disinfection Safe
Hot water, UV cabinet, and steam safe
Product Specifications
Product information
| Product Name | Grosmimi Stainless Steel Kids Tumbler |
| Capacity | 10oz / 300ml |
| Net Weight | 227g |
| Material | SUS 304/316 Stainless Steel |
| BPA | Free |
| Age | 18 Months+ |
| Country of Origin | Korea |
Policies
Shipping & Returns
Shipping
- Free shipping on orders over $50
- Standard shipping: $5.99
- Ships within 1-3 business days
- Delivery: 5-10 business days
Returns
- 30-day return policy
- Items must be unused and unopened
- Contact hello@onzenna.com to start
- Full refund to original payment
FAQ
Frequently Asked Questions
Read
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Reviews
What Parents Are Saying
Based on 27 reviews
would recommend
this product
Customer Photos
See it in real homes· 14 photos
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Sign In to Write a Review27 reviews
BriAnn B.
Amazing kids cup
I got this cup for my 5 year old to replace his Owala tumbler that always leaks and spills all over his backpack. He loves it! It’s easy to drink from and does not spill
ji
I like there is a silicone bottle to protect the bottom of the bottle
ji
Like the different color
ji
Work really nice!
Katie
Please offer a matching handle in the same color so you can use the straw option, too!
