Flum UT Bar Review: 2 Flavors, 12 Possibilities

Flum has been one of the best disposable vape brands for quite a while now, with the Flum Pebble earning great fame in the vaping community thanks to its large flavor selection, slim shape and friendly pastel colors. As the industry and its user base have matured, though, people have begun to demand more from their disposable vapes. They want devices that they can truly customize and make their own, and that’s led to a new generation of vapes with adjustable flavor.

The Flum UT Bar is the latest vape from Flum and one of the most advanced products in the new generation of adjustable devices. In addition to looking completely unique, it’s the first vape that lets you blend two flavors in whatever proportion you want. The UT Bar is already shaping up to be one of the hottest new vapes of 2026, and it should be at the top of your list if you’re on the hunt for a new experience, especially with its early momentum among Vape Juice customers.

View the Flum UT Bar now. If you’d like to see everything that’s available from this brand, you can also browse our full collection of Flum vapes.

UPDATE: Looking for information about the new Clear Tank UT Bar? Click here!

How Much Does the Flum UT Bar Cost?

The Flum UT Bar costs $16.95 at the time of writing, and it features a dual-tank system containing 15.5 ml of vape juice and lasting up to 50,000 puffs in all. The exact number of puffs that you get out of the device will depend on how you use it; you can expect the puff count to be reduced if you consistently set both tanks to operate at higher power levels.

Flum UT Bar Specifications

• Device Type: Disposable vape with two tanks and mixable flavors
• E-Liquid Capacity: 15.5 ml; device is advertised to last up to 50,000 puffs
• Battery Capacity: 760 mAh; battery charges in a little under an hour
• Vaping Modes: Device offers selectable power levels for both e-liquid tanks and has 12 possible settings in all
• Smart Display: Yes; display shows the current power level for both tanks, the battery’s charge level and the approximate remaining e-liquid in both tanks
• Adjustable Airflow: Yes; airflow is adjustable via a slider on the bottom of the device – slider can also be used to turn the device completely off

Flum UT Bar Features

Customizable Dual-Flavor System

The biggest feature of the Flum UT Bar is the dual-flavor design that’s implemented differently from any other vape that we’ve seen to date. Here’s how it works.

• The UT Bar has two separate e-liquid tanks, each with its own flavor and coil assembly. The flavors are typically very different from one another. For example, one UT Bar flavor has White Peach in the first tank and Raspberry in the second tank.
• Each coil assembly has adjustable wattage, allowing you to adjust the vapor delivery of each tank.
• Both coils have three power settings, and the second coil has an additional option that turns it completely off. That gives you 12 total settings from which to choose.

People always enjoy having the ability to customize their experience, and the Flum UT Bar takes this idea further than any vape that we’ve seen before. Until now, customizable flavor has always meant one of two things. Either you could switch between two different flavors but not vape both at the same time, or you could customize the level of a sweetness or coolness additive. The UT Bar lets you mix two different flavors in whatever proportion you like, and that adds a lot of fun and variety to the experience.

The UT Bar’s flavor customization does have one potential shortcoming, though, which is the fact that only the secondary tank has an “off” function – the first tank can’t be disabled. This creates a possibility of the first tank running out of vape juice while the second tank still has e-liquid in it. There’s a possibility of getting a burnt flavor at this point even though the UT Bar isn’t completely empty.

Completely Unique Design

Although the dual-tank design is undeniably the UT Bar’s biggest feature, it’s also worth mentioning that this device has a completely unique look and feel. There’s never been another vape that has looked quite like this one.

The UT Bar takes the soft colors and curved edges from the popular Flum Pebble and stretches those ideas even further. The design of the smart display is very creative and interesting, and it’s also functional because it’s very easy to understand the information conveyed. The UT Bar also has a round section on the back that’s slightly squishy, almost like a stress ball.

It's nice to see that Flum is continuing the design themes that they established with their previous device, and it’s also great to see any company doing something different from the usual space-themed designs and light shows that have become common over the past couple of years.

Great Flavor Selection for a New Vape

We’ll talk about the full range of UT Bar flavors in a moment, but it’s worth mentioning that the flavor selection is actually one of this device’s biggest features. It’s normal for a new vape to have a fairly small flavor selection out of the gate because the manufacturer wants to keep its production costs as low as possible until enough time has passed to see how the market will respond. Flum clearly knew that the UT Bar would be a hit, so they’ve given this device an impressive flavor selection right from the start.

What UT Bar Flavors Are Available?

The UT Bar flavor selection is so huge that it would be difficult to describe every option in a single review. Instead, we'll discuss a few that really stand out.

• Green Apple / Fuji Apple: The best UT Bar flavors are all about contrast, and you can imagine exactly what the people at Flum were going for with this flavor if you’ve ever had one of those “Double Apple” vapes. A vape really does a good job of capturing the authentic flavor of apple when it includes both sweet and sour elements, and this flavor gives you the ability to blend those elements to your taste.
• Naked / Spring Water: The Naked side of this offering is completely unflavored, and the Spring Water side includes a little menthol for coolness. Mix the two and create your ideal flavor profile.
• Banana Smoothy / Strawberry: Strawberry-banana is another one of the great flavor profiles in vaping, and this flavor gives you an opportunity to suit your personal taste by blending the two notes to your liking. The Banana Smoothy flavor is also great on its own, so you can enjoy the best of both worlds.
• Blue Razz / Lemonade: Speaking of contrast, Flum’s Blue Razz / Lemonade flavor gives you a chance to create a sweet-and-sour flavor profile that’s entirely your own. We wouldn’t blame you if you dialed both sides up to the max for an experience that’ll leave your tongue in a knot.
• Root Soda / Vanilla: This flavor is perfect for the soda nuts out there. Vanilla is always a great addition to a root beer flavor profile, and this flavor gives you the ability to add a little or a lot of it.
• Tobacco / Gold Tobacco: Offering two tobacco flavor profiles in one, this is a great offering for the picky tobacco lovers out there because it lets you dial up the complexity to levels that wouldn’t be achievable with a single-flavor vape.

Not sure which flavor to choose first? We’d suggest grabbing the Green Apple / Fuji Apple flavor if you’re a fruit lover. As we’ve discussed many times on this site, many of the best vape flavors are studies in contrast between sweet and sour. Never before, though, have you been able to customize those two aspects of a flavor profile to your exact taste. This flavor is a perfect introduction to the qualities that make the UT Bar such a groundbreaking vape.

Flum UT Bar Review: Our Expert Perspective

Overall, the Flum UT Bar represents a huge step forward for flavor customization in vaping. We have seen devices with secondary support tanks for additives before. The Juice Head Flex Freeze – which lets you customize the level of coolness in the vapor – is a prominent example of this. Until now, though, we’ve never seen a device that allowed you to mix two completely different flavors in whatever proportion you want. That’s a big deal, and it’s a sure thing that other companies will be copying Flum’s idea very soon.

The UT Bar is a must-try device for just about anyone. Even if the idea of mixing two different flavors in a vape has never occurred to you before, you owe it to yourself to experience it once because no other brand has done anything like this until now.

At the same time, new technologies always have room for improvement. The UT Bar is spectacular as it is, but it would be even better if it had the ability to turn the primary flavor off for more complete usage of both flavors. Adding that feature should be relatively easy, so it’s something that we can hopefully look forward to in a future version of the UT Bar.

Best Points

• First vape that lets you blend two flavors to suit your personal taste
• 12 possible flavor settings in all
• Huge flavor selection for a newly released device
• Unique design features a curved shape, soft colors and a squishy section on the back panel

Could Be Improved

• Primary e-liquid tank could use an “off” function; no way to vape the secondary flavor on its own

June 2026 Update: What’s the New UT Bar Clear Tank?

You may have noticed the new Clear Tank UT Bar making the rounds here at Vape Juice, and we thought it would be a good idea to update this review to explain what Flum’s new device is. The Clear Tank UT Bar is actually quite different from the original UT Bar even though the shape is the same. Here’s what you need to know.

Clear Tank

The biggest difference in Flum’s new UT Bar is right there in the name: Its e-liquid is stored in a clear tank, so there’s no need for an e-liquid meter on the screen. The Clear Tank UT Bar is advertised to produce the same 50,000 puffs as the original UT Bar, but you’ll probably get more puffs out of it in practice because clear tanks always waste less vape juice than traditional sponge-based e-liquid storage systems.

Single Flavor

The next major difference between the original UT Bar and the Clear Tank variation is that the Clear Tank UT Bar has one flavor only and doesn’t support mixing the two flavors. So, if you like the UT Bar shape and flavor quality but don’t really use the flavor-mixing feature, the Clear Tank UT BAR might be the right choice for you. You’ll also get more puffs for the money, which is a nice little bonus.

Flavor Selection

The Clear Tank UT Bar has a few of the usual UT Bar favorites along with some new offerings that you may not have seen before. Here’s an overview of your choices.