FREE STANDARD US SHIPPING ON ALL TUMBLERS
Featured in this video
30oz Dual-Chamber Tumbler
Choose your bundle
Your Splitflask
Elle Pink · Cup + Comfort-Grip Handle
Built around the way you carry your day.
- Color
- Elle Pink
- Quantity
- 1 cup
- Setup
- Cup + Comfort-Grip Handle
Bestseller
Patented
30oz Dual-Chamber Tumbler for Coffee and Water
2 x 15 fl oz
$56.00 USD
Regular price
$56.00 USD
Choose your paid colors
Free cup colors are a surprise
Unit 1
Mystery Color
Chosen for you
FREE
Unit 2
Mystery Color
Chosen for you
FREE
Unit 3
Mystery Color
Chosen for you
FREE
Unit 4
Mystery Color
Chosen for you
FREE
Unit 5
Mystery Color
Chosen for you
FREE
Your paid colors and Mystery Color gift cups are added together.
Looking for a sold-out color? Get availability updates
Choose the color you want and we’ll let you know about availability.
Temperature performance
Two hot drinks: up to 4 hours. Two cold drinks: up to 6 hours. Hot and cold together: hot for 2+ hours and cold for 4+ hours.
Actual retention varies with starting temperature, fill level, ice, room temperature, and how often each side is opened.
Dimensions & weight
Height: 9.39 in (238.5 mm). Lid: 4.42 × 3.97 in (112.3 × 100.8 mm). Base: 3.02 in (76.7 mm) diameter.
1.5 lb empty and approximately 3.3 lb with both chambers filled. Measure your cupholder or bag pocket against these dimensions for the best fit.
Materials, included lid & bag use
Every current color/SKU uses the same tested materials. The stainless-steel cup includes a straw-and-spout lid made with polypropylene, silicone, and Eastman Tritan™ copolyester. Drink-contact components are BPA- and BPS-free.
The included lid is safe for loose-bag transport when it is fully secured, the center seal is aligned with the divider, and both closures are completely shut. See materials and testing details or shop an extra lid.
Shipping & one-year warranty
Free standard US shipping on every tumbler order. Orders process in 1–2 business days; standard US delivery typically takes 3–5 business days after shipment. Tracking is included. Rates for accessory-only orders and international destinations are shown at checkout.
Your tumbler and included components are covered by our one-year limited warranty against defects in materials and workmanship under normal use. Read the warranty.
See it in action
Quick demos from real customers
Featured in this video
30oz Dual-Chamber Tumbler
Choose your bundle
Featured in this video
30oz Dual-Chamber Tumbler
Choose your bundle
Product details
One 30oz dual-chamber tumbler. Two separate drinks.
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.
Why choose the Splitflask 30oz tumbler?
- Two separate 15oz chambers: Fill both sides with water for a 30oz hydration checkpoint, or carry two different drinks at once.
- Independent vacuum insulation: The divided stainless steel interior limits temperature transfer between chambers.
- Food-grade 18/8 stainless steel: Durable, reusable, and made for everyday beverages.
- Secure, leak-resistant seals: Carry it confidently when both lids are assembled and closed correctly.
- Cup-holder-friendly shape: A streamlined alternative to carrying two separate bottles or travel mugs.
A simpler daily hydration routine
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.
Frequently asked questions
Can I carry coffee and water at the same time?
Yes. The two sealed chambers keep the drinks separate, allowing you to carry hot coffee in one side and cold water in the other.
How much does each chamber hold?
Each chamber holds 15oz, providing 30oz of total capacity across the tumbler.
Can I put water in both chambers?
Yes. Filling both chambers with water gives you one full 30oz hydration checkpoint.
Does it fit in a cup holder?
Splitflask is designed for most standard cup holders, although exact fit can vary by vehicle or equipment.
30oz Dual-Chamber Tumbler
$56.00 USD
Elle Pink
Regular price
$56.00 USD
Know before it arrives
Clear specs. Real-world expectations.
The measurements, weight, and temperature details you need to decide whether the 30 oz Splitflask fits your day.
- Capacity
- 30 oz totalTwo 15 oz chambers
- Overall height
- 9.39 in238.5 mm
- Lid footprint
- 4.42 × 3.97 in112.3 × 100.8 mm
- Base diameter
- 3.02 in76.7 mm · measure your cupholder
- Empty weight
- 1.5 lbBefore adding drinks
- Filled weight
- Approx. 3.3 lbWith both chambers filled
Temperature performance
What to expect from each setup
Two hot drinks
Up to 4 hours
Two cold drinks
Up to 6 hours
Hot + cold together
Hot 2+ hrs · Cold 4+ hrs
Actual retention varies with starting temperature, fill level, ice, room temperature, and how often each side is opened.
Two chambers, your routine
One tumbler. More ways to use it.
- Coffee + water
- Water + electrolytes
- Tea + water
- Two favorite flavors
What is in it
Materials you can name. Testing you can trace.
Clear answers about the parts that touch your drinks, what comes in the box, and how the current product was evaluated.
Drink-contact materials
Known materials, every color.
- Vacuum cup
- Food-contact stainless steel
- Included lid system
- Polypropylene, silicone, and Eastman Tritan™ copolyester
Every current color/SKU uses the same tested materials. Drink-contact components are BPA- and BPS-free.
Loose-bag ready
Close it fully. Pack it confidently.
Splitflask is safe for loose-bag transport when the lid is fully secured, the center seal is aligned with the divider, and both the straw and spout closures are completely shut.
Wipe away any liquid around the lid before packing.
Included with your cup
The dual lid is not an add-on.
Every 30 oz Splitflask includes its straw-and-spout lid. Purchase another only if you want an extra or replacement.
Shop an extra lidIndependent component reports See what the testing covers
Reports supplied for current production components include:
- Stainless-steel vacuum cup: passed total chromium composition testing and California Proposition 65 lead and phthalates screening.
- Polypropylene straw and lid components: evaluated to applicable FDA 21 CFR 177.1520 material requirements.
- Silicone components and non-slip base: evaluated through FDA 21 CFR 177.2600 extractives testing and REACH SVHC screening, as applicable.
- Exterior UV coating: passed volatile organic compound (VOC) testing to the cited test method.
- Eastman Tritan™ TX1001 lid material: supported by food-contact documentation; third-party testing cited by the supplier did not detect BPA in representative Tritan copolyester samples at a 5 ppm detection limit.
These results apply to the identified materials and components used across current Splitflask colors/SKUs. They describe material and product testing—not medical benefits.
Customer story
A better way to carry two daily drinks
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.
Built for real routines
Two drinks. One less thing to carry.
Created by Cheryl, a NICU nurse and mom of three, for days when choosing just one drink—or carrying two cups—doesn’t make sense.
Parent days
Keep your drink separate from a child’s cold drink while both stay in one cup.
Long shifts
Bring a morning coffee and water in one container. Follow your workplace’s drink and spill policies.
Commutes
Set one tumbler in the cup holder instead of finding room—and a free hand—for two.
Postpartum routines
Keep water and a favorite second drink within reach when your hands and attention are already full.
GLP-1 routines
Carry plain water alongside another beverage you already choose, with separate sips available from either side.
Gym & errands
Pair water with your preferred second cold drink without mixing flavors or packing another bottle.
Customer submitted
Splitflask, out in the world
REAL CUSTOMERS TALK
“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
HOW IT WORKS
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.
SEE THE DIFFERENCE
Two drinks shouldn't require two cups.
Splitflask combines the separation of two containers with the convenience of one everyday tumbler.
| What matters | Best of bothSplitflask2 drinks · 1 cup | Regular tumbler1 drink · 1 cup | Two separate cups2 drinks · 2 cups |
|---|---|---|---|
| Carries two different drinksKept separate | Yes | No | Yes |
| Hot + cold at the same timeWithout mixing | Yes | No | Yes |
| Keeps drinks separatedFrom fill to finish | Two chambers | One chamber | Separate containers |
| Uses one cup holderLess car clutter | Yes | Yes | No |
| One item to carryOne-hand convenience | Yes | Yes | No |
| Choose either sipWithout opening another cup | Dual-sip lid | Single opening | Two separate lids |
| Dishwasher safeSimple everyday cleanup | Yes · top rack | Varies | Varies |
COMPLETE THE SET
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.
Does the straw-and-spout lid come with the tumbler?
Yes. Every 30 oz Splitflask includes the dual straw-and-spout lid.
You only need to purchase another lid if you want an extra or replacement.
What materials are used?
The vacuum cup is food-contact stainless steel. The included lid system is made with polypropylene, silicone, and Eastman Tritan™ copolyester.
Drink-contact components are BPA- and BPS-free. Every current color/SKU uses the same tested materials. See the independent testing summary.
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?
Splitflask is safe for loose-bag transport when the lid is fully secured, the center seal is aligned with the divider, and both the straw and spout closures are completely shut.
Wipe away any liquid around the lid before packing it.
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. With hot and cold together, expect the hot side to last 2+ hours and the cold side to last 4+ hours.
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.
With one hot and one cold drink, expect 2+ hours on the hot side and 4+ hours on the cold side. The tradeoff is convenience: one cup instead of two.
Actual retention varies with starting temperature, fill level, ice, room temperature, and how often each side is opened.
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?
The 30 oz Splitflask weighs 1.5 lb empty and approximately 3.3 lb with both chambers filled.
It's heavier than a standard tumbler because it's built to replace two drink containers with one.
Will it fit in my car's cup holder?
The base is 3.02 in (76.7 mm) in diameter. Cupholder sizes vary, so compare that measurement with your vehicle for the best fit.
The tumbler is 9.39 in (238.5 mm) tall, and the lid measures 4.42 × 3.97 in (112.3 × 100.8 mm).
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.
With two cold drinks, expect up to 6 hours of temperature retention.
Many customers use:
- Water + electrolytes
- Sparkling water + still water
- Two different flavored drinks
Can I use two hot drinks?
Yes.
With two hot drinks, expect up to 4 hours of temperature retention.
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.
Shipping, warranty & 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.
How long does US delivery take?
Orders process in 1–2 business days. After shipment, standard US delivery typically takes 3–5 business days and includes tracking.
Every tumbler order includes free standard US shipping. Rates for accessory-only orders and international destinations are shown at checkout.
What does the one-year warranty cover?
The Splitflask One-Year Limited Warranty covers eligible defects in materials and workmanship under normal use for the original purchaser.
It covers the tumbler and the components included with it. Proof of purchase is required; the warranty page lists exclusions and claim steps.
What if something arrives damaged?
Email hello@splitflask.com with your order number, a description, and clear photos or video. We will review it under the one-year limited warranty or the applicable delivery policy.
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.
