Personalized 30oz Splitflask Tumbler

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.

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.

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.

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.

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.

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.

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.

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.

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.

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.

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).

Each chamber holds approximately 15 oz.

Together, that's 30 oz total.

Yes.

Top rack is recommended.

Not at all.

Most people use:

• Dishwasher
• Bottle brush
• Straw brush

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.

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

Yes.

With two hot drinks, expect up to 4 hours of temperature retention.

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.

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.

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.

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.

We typically respond within 24–48 business hours.

Real humans read every message.