Every sip sends some back.
Kids push spit and snack bits back down the straw. A single drop of saliva carries millions of bacteria.
What's Really in the Cup
Backwash is Gross. So We Fixed it.
It mixes in and multiplies.
Clemson researchers found sipped water had over 1,000 bacteria. Untouched water had under 10. In a 2021 Dentistry Journal study, bacteria in a sipped drink multiplied about 100 times in a day at body temp.
The bacteria grows.
Backpack, park, hot car. By pickup, they're sipping their own leftovers.
KinSip catches it.
Two one way valves send backwash into its own removable chamber. The drink stays the drink.
HOW IT WORKS
Sip it. Catch it. Rinse it.
1. Sip
Your kiddo drinks like normal. They won't notice a thing, but you will.
2. Catch
Backwash takes a different path, into its own chamber.
3. Rinse
Rinse and repeat.
Everything You Want, Plus One Thing No One Else Has.
 | Most sippy cups | Most kids tumblers | |
|---|---|---|---|
| Backwash goes to its own chamber | |||
| 316 Stainless Steel Inner Wall | Plastic | Usually 18/8 | |
| Vacuum insulated | Rarely | ||
| Removable handle | Sometimes | Rarely | |
| Drinks like a normal straw cup |
Based on common materials and features of popular sippy cups and kids tumblers.
Made for Little Hands. Built to Last.
A handle sized for tiny grips. A lid that's ready for car rides.
The backwash chamber does its thing quietly inside. Your kid won't notice a thing. But you sure will.
Everything you love in a great cup... +more
✓ 316 Stainless Steel Inner Wall
✓ Vacuum Insulated
✓ Leak Resistant Lid
+ Patent Pending Backwash Chamber
Pre-Order is Live
Not Your Average Kids' Cup
Receive cup by mid December
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Frequently asked questions
KinSip isolates backwash instead of allowing it to flow back into the main drink. Our internal one-way valve system redirects it into a separate collection chamber.
No. They sip from KinSip just like a normal straw cup.
It is redirected into a separate removable chamber built into the lid system.
Yes. The inside of the collection chamber is easily accesible so it can be emptied and cleaned.
Approximately 384 mL / 13 oz.
The main vessel is stainless steel, with food-contact components selected specifically for everyday drinkware use and lab-tested so that our products meet all applicable standards.
Yes. The stainless-steel vessel is designed to help maintain drink temperature.
It's designed primarily for kids who are comfortable drinking independently through a straw.
Our current estimate is mid December 2026. Customers will receive updates if the production or shipping schedule changes.