Grosmimi Stainless Steel Straw Cup with Flip Top - 6oz (12 Months+)
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Choose your baby's stage· One cup that grows with your baby
Material: Stainless Steel
Size & Type: 6oz & Flip Top
Color: Air Balloon Blue
Description
Grosmimi Stainless Steel Straw Cup is made with an outer layer of high-quality 304 stainless steel and an inner layer of premium 314 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: 6oz (200ml)
- Dimensions: 15.5cm H x 10.0cm W x 6.9cm D
- Weight: 188g
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
Leak-proof sips, happy moments.
Korea’s No.1 Toddler Straw Cup
946,000+
Cups sold annually
30+ Countries
Loved by moms worldwide
Patented tech
On the straw-nipple design
CPSIA Compliant
Tested by a CPSC-verified lab
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
← This product300ml
More volume for bigger appetites
When 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.
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
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.
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
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.
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.
One of the Top 5 Best-Selling Toddler Straw Cup Brands on Amazon US
#1 Best-Selling PPSU Straw Cup
Over 8,000 reviews ★ 4.5 out of 5.0 rating
Real reviews
Real parents, real reviews.
Creators using this with their own kids.
Replacement
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 22 reviews
would recommend
this product
Customer Photos
See it in real homes· 12 photos
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Sign In to Write a Review22 reviews
Sarah S.
great cup, loud when dropped
great product, very $$$$ and loud when dropped
Meg
The cutest cup! Especially perfect for hot summer days! Will purchase again
Val
Best straw cup ever!
For me it was very important to get a stainless steel cup since we didn’t want to use plastic. These are so well made and they are beautiful. My baby loves them! Worth the price 100%!!
Vicky
Nice water bottle
My 10 month old baby loves this bottle. It doesn't leak and easy to clean. The only problem the plastic lid broke after a couple months of use. I tried to use glue on it but unfortunately it did not work and the replecament cap is not available in pistachio. I still recommend it because baby my baby can use it easily by himself.
Charisse
Great sturdy non-toxic water bottle, toddler learned easily how to drink and operate it
