Your Splitflask
Built around the way you carry your day.
2 x 15 fl oz
Multi-color bundles use Add to cart so all your colors stay together.
Splitflask is a patented 2-in-1 insulated water bottle with two sealed 15oz chambers. Carry hot coffee and cold water—or another compatible pair of beverages—in one cup without mixing flavors.
Designed by a NICU nurse who was tired of juggling separate drink containers, Splitflask makes daily hydration simpler at work, in the car, at the gym, and on the go.
Use each full 30oz fill as a visible checkpoint toward your water goal. Three full fills equal 90oz; if one 15oz chamber holds coffee or another drink, the water chamber still gives you an easy refill-by-refill measure. Hydration needs vary, so choose a goal that fits your health, activity, and clinician guidance.
Yes. The two sealed chambers keep the drinks separate, allowing you to carry hot coffee in one side and cold water in the other.
Each chamber holds 15oz, providing 30oz of total capacity across the tumbler.
Yes. Filling both chambers with water gives you one full 30oz hydration checkpoint.
Splitflask is designed for most standard cup holders, although exact fit can vary by vehicle or equipment.
Customer story
After recovering from leukemia, Mary returned to work in a hospital and spent four to five hours on her feet during each shift. She wanted to carry water along with a calorie-rich drink, but carrying two separate bottles was inconvenient.
Splitflask gave her a simpler option: two separate beverages in one bottle. Today, it helps her carry the drinks she relies on throughout her workday.
Yes, you make a difference.— Mary S., Splitflask customer
Shared with permission.
“As someone who needs caffiene *and* hydration on the go, this tumbler is a game-changer. The dual chambers keep my coffee hot and water cold for hours. Genius idea!”
– Hayley Zovickian, Buzzfeed
Simply pour your drinks into each chamber one at a time.
Place the lid with the straw side over your cold drink and the spout side over your hot drink.
Lift the straw to sip your cold drink or the spout to swig your hot drink.
The honest FAQ
The best FAQs are the questions people are afraid to ask. Here are the honest answers.
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.
Because most people already carry two drinks.
Splitflask lets you carry both in one place instead of juggling two separate containers.
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.
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.
Yes.
That's one of the most common ways people use Splitflask.
Coffee + water is one of our customers' favorite combinations.
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.
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.
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.
Yes.
Splitflask is designed to fit most standard vehicle cup holders.
Each chamber holds approximately 15 oz.
Together, that's 30 oz total.
Yes.
Top rack is recommended.
Not at all.
Most people use:
Like any insulated tumbler, occasional deep cleaning is recommended.
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.
Absolutely.
Many customers use:
Yes.
You can use both sides however you'd like.
Of course.
You're not required to use both chambers.
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.
Contact us and we'll make it right.
We typically respond within 24–48 business hours.
Real humans read every message.
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.
