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Separate chambers
A permanent divider prevents flavors and liquids from mixing.
Patented dual-chamber tumbler
One cup. Two drinks. Finally.
Hot coffee in one side. Ice water in the other. Each stays separate, so you can stop carrying two containers everywhere.
- Two sealed 15 oz chambers
- Independent hot and cold insulation
- Leakproof and cupholder-friendly
Rated 4.9 Stars by verified Splitflask customers
Hot
+
Cold
2 × 15 oz
sealed chambers
Free US shipping over $60
30-day guarantee to try it
Patented design built to last
The cup people are talking about
Patented dual-chamber design
A smarter way to carry both
Your two favorite drinks. Not mixed.
Splitflask turns a two-bottle routine into one clean, one-handed carry—without making you choose between caffeine and hydration.
Separate temperatures
Independent insulation protects each drink's temperature.
One easy carry
One tumbler, one cupholder, and one free hand.
See it in action
Dual Drink Tumbler
Two sealed 15 oz chambers in one 30 oz tumbler
Independent insulation keeps each drink at its own temperature
Leakproof, BPA/BPS-free, cupholder-friendly, and top-rack dishwasher safe
$56.00 USD
Regular price
$56.00 USD
How it Works
1. Fill both chambers
Pour one drink into each 15 oz chamber.
2. Align the lid
Place the straw over your cold drink and the spout over your hot drink.
3. Sip either side
Flip the straw or open the spout to enjoy each drink independently.
Real-world ways people use Splitflask
Customer Stories
Invented by a NICU Nurse
During long hospital shifts, co-founder Cheryl kept facing the same choice: bring coffee or bring water. That everyday frustration became Splitflask—a practical way to carry both without juggling two containers.
The Science & Design
Behind Splitflask is patented engineering that combines two fully insulated chambers into one bottle, allowing you to enjoy hot and cold drinks side by side.
The honest FAQ
Questions worth asking before you buy
The best FAQs are the questions people are afraid to ask. Here are the honest answers.
Before you buy
Is Splitflask for everyone?
Honestly? No.
If you're looking for a cup that keeps a drink untouched for 8+ hours, there are better options.
If you're tired of carrying two drinks everywhere, that's exactly why Splitflask exists.
The big question
Why would I want two drinks in one cup?
Because most people already carry two drinks.
- Coffee + water.
- Electrolytes + hydration.
- Pre-workout + water.
- Tea + water.
Splitflask lets you carry both in one place instead of juggling two separate containers.
Do the drinks mix together?
No.
Each drink sits in its own chamber.
The only requirement is that the lid is aligned with the center divider when you close it.
Once aligned correctly, both drinks stay separated.
Does it leak?
When the lid is aligned correctly and fully closed, it is designed to keep both chambers sealed.
Most leak complaints come from incorrect lid alignment.
Temperature questions
Can I put a hot drink on one side and a cold drink on the other?
Yes.
That's one of the most common ways people use Splitflask.
Coffee + water is one of our customers' favorite combinations.
Will the hot side affect the cold side?
Over time, some temperature influence is normal.
You're carrying a hot drink and a cold drink in the same container.
The tradeoff is convenience: one cup instead of two.
For most daily routines, commutes, workouts, and workdays, both drinks remain enjoyable and usable.
Is this a replacement for a high-end thermos?
No.
This is a two-drink solution.
It's built for people who want to carry two drinks in one cup—not people trying to keep coffee untouched all day.
Size & weight
Is it heavy?
It's heavier than a standard tumbler because it's carrying two drinks instead of one.
Think of it this way:
You're replacing two containers with one.
Will it fit in my car's cup holder?
Yes.
Splitflask is designed to fit most standard vehicle cup holders.
How much does each side hold?
Each chamber holds approximately 15 oz.
Together, that's 30 oz total.
Cleaning
Is it dishwasher safe?
Yes.
Top rack is recommended.
Is it difficult to clean?
Not at all.
Most people use:
- Dishwasher
- Bottle brush
- Straw brush
Like any insulated tumbler, occasional deep cleaning is recommended.
Using it
Is there a learning curve?
A tiny one.
The biggest thing to remember is aligning the lid correctly with the divider.
Most people figure it out after their first use.
Can I use two cold drinks?
Absolutely.
Many customers use:
- Water + electrolytes
- Sparkling water + still water
- Two different flavored drinks
Can I use two hot drinks?
Yes.
You can use both sides however you'd like.
Can I use one side and leave the other empty?
Of course.
You're not required to use both chambers.
Returns & support
What if I don't love it?
If you buy through Amazon, Amazon's return policy applies.
If you buy through Splitflask.com, see our return policy page for current return options.
What if something arrives damaged?
Contact us and we'll make it right.
How quickly do you respond to support requests?
We typically respond within 24–48 business hours.
Real humans read every message.
The question nobody else asks
What's the catch?
Every product has tradeoffs.
Splitflask's tradeoff is simple:
It's larger than a regular tumbler and takes one use to learn.
In return, you stop carrying two drinks everywhere.
Most people decide that's a trade worth making.