Grosmimi Stainless Steel Straw Cup with Flip Top - 10oz (12 Months+)
Free shipping on orders $75+ · Ships in 1-3 business days
Choose your baby's stage· One cup that grows with your baby
Material: Stainless Steel
Size & Type: 10oz & Flip Top
Color: Flower Coral
Quantity
Description
Grosmimi Stainless Steel Straw Cup is made with an outer layer of high-quality 304 stainless steel and an inner layer of premium 316 stainless steel. The newest version features great improvements in coating, design, and the addition of a flip-top. Age Recommendation: Suitable for babies12+ months, toddlers transitioning from Stage 1 straw cups, or parents looking for a firmer straw option as teething begins.
This cup with the newest, dome shaped flip-top lid (One Touch Cap), has a lock feature, and is much easier for the baby to use with one hand. Stage 2 Straw kit is included
Vacuum Insulated: Keeps beverages hot and cold up to 6 hours.
Leak-Free: ‘+ CUT’ prevents any leak from the bottle, 2-way of using allows baby to drink no matter sitting down (with the tube) or lying down (without the tube)
Easy to Clean: It is so easy to separate all the parts for hygienic cleaning and reassemble them in a few seconds
Specs
- Capacity: 10oz (300ml)
- Dimensions: 19.5cm H x 10.0cm W x 6.9cm D
- Weight: 216g
Materials
- Bottle is made of stainless steel
- Lid and handle are made of BPA-free plastic
- Straw is made of platinum silicone
Care Guide
RECOMMENDATIONS & WARNINGS:
- Always use this product with adult supervision
- Never use straw teats as a soother
- Continuous and prolonged sucking of fluids will cause tooth decay
- Always check food temperature before feeding
- Inspect before each use and pull the feeding teat in all directions. Throw away at the first signs of damage or weakness
- Do NOT leave in disinfectant for longer than recommended, as this may weaken the teat
- Before first use place a feeding teat in boiling water for 30 seconds. This is to ensure hygiene
- Please wash before using
- Please use a straw brush when washing the straw and teat
- Avoid direct sunlight or fire
- Please replace the silicone parts every 2-3 months for hygienic issues
- The cup is NOT microwaveable
- Straws are not suitable for a child under 6 months
- Please read the information on the leaflet enclosed before use
Why Grosmimi?
6 reasons parents choose Grosmimi
Stainless Steel Body
SUS 304/316 stainless steel keeps drinks at the right temperature. Durable, hygienic, and taste-neutral.
One-Touch Flip Top
Opens with a single press for easy on-the-go drinking. Locks shut securely.
Soft Liquid Silicone
Softness and smoothness of the straw protect baby's teeth and gums.
Leak-Proof '+Cut' Straw Design
The + cut prevents leaks even when the cup is upside down.
Easy to Clean
Wide-neck design makes the cup easy to wash and assemble.
Made in Korea
Manufactured by Grosmimi in Korea.
Leak-Proof Design
Squeeze it. Pinch it. It won't leak.
The + cut straw tip seals under pressure. Toss it in the diaper bag — no spills, no mess.
✓ + Cut seals under pressure. No extra valves.One Touch Cap
Open with one hand. While holding baby with the other.
Thumb-press flip cap opens instantly. Steel-free, anti-dust design keeps the straw clean between sips.
✓ One Touch Cap — steel-free, anti-dustSealed in Motion
Shake it. Swing it. Still sealed.
Toddlers don't just drink — they shake, throw, and swing. The + cut straw stays sealed through all of it.
✓ + Cut stays sealed during motion
Selection Guide
Start small, then size up.
The 200ml flip top is lighter and easier for toddlers to carry. The 300ml is ideal for longer outings or when your child drinks more volume.
200ml
Compact, lighter, easier to hold
300ml
More volume for bigger appetites
← This productWhen babies start teething, they begin to chew on the straw teat. For babies over 12 months who tend to bite, a firmer straw teat is available separately.
What's Included
Everything in the box
Includes Straw teat. Additional straw teats and accessories are available separately.
Cup Body
PPSU or Stainless Steel
Flip Top Cap
One-touch open
Silicone Straw Teat
Included
Silicone Straw Tube
Replaceable
Weighted Straw Kit
Any-angle drinking
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
Policies
Shipping & Returns
Shipping
- Free shipping on orders over $75
- 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
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Reviews
What Parents Are Saying
Based on 44 reviews
would recommend
this product
Customer Photos
See it in real homes· 2 photos
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Sign In to Write a Review44 reviews
Donald Y.
Love this!!
Fits in my bottle washer. Amazing.
Krista A.
Must buy!
My son loves this cup and I love that it’s spill proof! Highly recommend!!
Asena H.
so cute and functional
love this so cute and functional my daughter obsessed
Kamal
I love it
BriAnn B.
Spill proof cup
I have been through all the straw cups for my 2 toddlers to drink from that do not leak. I have tested this one and it’s the first to actually not leak. Love it and highly recommend!
