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Flum UT Bar 50K: How It Works and Is It Worth It?
Disposable Vape Guide • November 2026
Quick answer: The Flum UT Bar 50K is a rechargeable disposable with two separate flavor tanks in one body. You switch between the two flavors on the device, choose Eco mode (rated up to 50,000 puffs) or Turbo mode (up to 25,000 puffs, bigger vapor), and recharge the 760mAh battery over USB-C. It holds about 17mL of 5% (50mg) nicotine salt e-liquid in total. It's worth it if you like switching flavors during the day and want one device to last a long time.
What Is the Flum UT Bar 50K?
Most disposables give you one flavor until the device runs out. The UT Bar 50K splits the device into two pre-filled tanks, each with its own flavor, which is why every option is sold as a pair, like Watermelon / B-Pop or Miami Mint / Mint Slushy. You get two flavors in one device instead of buying two.
Here are the UT Bar 50K's published specifications:
| Spec | Flum UT Bar 50K |
|---|---|
| Puff rating | Up to 50,000 (Eco) / 25,000 (Turbo) |
| Flavors per device | 2 (two separate tanks) |
| E-liquid | About 17mL total, pre-filled |
| Nicotine | 5% (50mg) nicotine salt |
| Battery | 760mAh, rechargeable |
| Charging | USB-C |
| Display | Battery and e-liquid level indicators |
| Airflow | Adjustable |
| Activation | Draw-activated |
How the Two Flavor Tanks Work
The two flavors aren't mixed in one tank. Each flavor sits in its own tank, and you choose which one you're vaping on the device. That means you can, for example, start the day on the fruit side and switch to the mint side later without carrying a second vape.
The round display on the front shows battery and e-liquid levels, so you can check how much is left before a side runs dry. You can see it in the product photos.
A practical tip: the two sides won't always empty at the same rate. If you vape one flavor much more than the other, that side will run out first, and the device's total puff count will come from both tanks combined, not one.
Eco vs Turbo: Where the 50,000 Puffs Comes From
The UT Bar 50K has two power modes. Eco is the standard setting, and it's where the 50,000-puff rating comes from. Turbo produces more vapor but uses e-liquid faster, so its rating drops to 25,000 puffs.
It helps to do the math. 50,000 puffs from about 17mL works out to roughly 2,900 puffs per mL in Eco, and about 1,500 per mL in Turbo. Puff ratings are estimates based on short, consistent draws. Longer pulls, Turbo mode and chain-vaping all mean fewer real puffs. One independent hands-on review reported roughly 38,000 to 42,000 puffs in Eco, which is still a long run for one device.
That's also why e-liquid volume tells you more than the puff number on the box. We break that down in What Does 100K Puffs Mean? Puff Count vs E-Liquid (mL) Explained.
Charging and Battery
Despite the "disposable" label, the UT Bar 50K is rechargeable. The 760mAh battery charges over USB-C, which is how one device can last through all 17mL of e-liquid. The box includes the device only, so you'll need your own USB-C cable. When the e-liquid indicator shows both sides empty, the device is done; recharging won't refill it.
Which Flavor Pair Should You Get?
Every UT Bar 50K comes as a pair of flavors. Here are three pairs available at Flawless as of November 2026:
Watermelon / B-Pop
Classic summer watermelon with a bubbly twist on the B-Pop side. A good pick if you want two fruity profiles in one device.
Miami Mint / Mint Slushy
Tropical-cool "Miami" mint paired with an icy mint slushy. Best for mint fans who want variety without leaving mint.
Naked / Spring Water
A newer pair built around a clean, crisp profile. Worth a try if you prefer something lighter than candy and fruit flavors.
Choose your pair from the flavor menu on the Flum UT Bar 50K product page. Flum makes many more pairs, and availability changes often, so check there for the current list.
Is the Flum UT Bar 50K Worth It?
It's a good fit if you:
- Like switching between two flavors during the day
- Want a rechargeable disposable that lasts a long time
- Want a simple, draw-activated device with a screen that shows what's left
- Prefer 5% nicotine salt
You may want something else if you:
- Want the most e-liquid in one device. The HorizonTech 100K holds 40mL.
- Want to refill with your own e-liquid or lower nicotine. A pod system gives you that control; see Pod System vs Disposable Vape.
- Only ever vape one flavor. A single-flavor disposable may suit you better.
Not sure which features matter most to you? Read How to Choose Vape Features That Are Actually Useful, or browse the full Flum collection.
Flum UT Bar 50K FAQ
How many puffs does the Flum UT Bar 50K really get?
It's rated up to 50,000 puffs in Eco mode and 25,000 in Turbo. Real-world numbers depend on how long you draw and which mode you use. One independent review reported about 38,000 to 42,000 puffs in Eco.
Is the Flum UT Bar 50K rechargeable?
Yes. It has a 760mAh battery that charges over USB-C (cable not included). Recharge it when the battery runs low; the device is finished when the e-liquid runs out.
Can you switch flavors on the UT Bar 50K?
Yes. Each device has two flavor tanks, and you switch between them on the device.
What nicotine strength is the UT Bar 50K?
It uses 5% (50mg) nicotine salt.
Content Sources
Flawless Vape Shop
Flum UT Bar 50K Disposable product page
What Does 100K Puffs Mean? Puff Count vs E-Liquid (mL) Explained
Independent review
Vape Observation: Flum UT Bar 50K review