We stock over 30 vape brands at VapesOnlineShop. Flum is one of the more interesting ones — not because it dominates any single category, but because it offers things no other brand does. The UT Bar Pro 50K's dual-flavor switching system is a market first. The Mello 20K's themed editions (City Series, Floral Delights) explore flavor territory other brands ignore entirely. And at $22.99–$24.99, Flum is consistently 10-15% cheaper than equivalent devices from RAZ.
This review covers the Flum brand as a whole — all four current devices, the brand's strengths and weaknesses relative to competitors, and who Flum is and is not for.
The Full Flum Lineup — Quick Overview
| Device | Line | Puffs | Flavors | Key Feature | VOS Price | VOS Rating |
|---|---|---|---|---|---|---|
| UT Bar Pro 50K | UT | 50,000 | 40 | Dual-Flavor Switch | $24.99 | 9.0 |
| Float Mello Pro 50K | Mello | 50,000 | 10 | Turbo / Eco Mode | $24.99 | 8.5 |
| UT Bar Pro 25K | UT | 25,000 | 19 | Galaxy LED, Smooth/Turbo | $23.99 | 8.2 |
| Mello 20K | Mello | 20,000 | 33 | 6 Themed Editions, Animated Screen | $22.99 | 8.2 |
For individual device deep dives, see our dedicated reviews linked above. For the complete flavor database, see Flum Vape Flavors.
What Flum Does Better Than the Competition
Dual-flavor switching is a category of one. The UT Bar Pro 50K's two-tank system with Mix Mode has no equivalent from RAZ, Geek Bar, Lost Mary, or any other brand we carry. This alone makes Flum worth considering for anyone who regularly switches between flavors.
Creative flavor curation. The Mello 20K's themed editions — City Series (mint-based flavors named after European cities), Floral Delights (actual floral notes), Valentine and Christmas seasonals — go places other brands do not. RAZ has more total flavors, but Flum has more creative range.
Aggressive pricing. $22.99–$24.99 across the entire lineup makes Flum 10-15% cheaper than RAZ in the 50K tier and competitive with everyone else. The $0.50/1K-puff cost on the 50K models is the best value in our store. Full breakdown: Flum Price Guide.
Two distinct product lines for different users. The Mello line (lifestyle, design, creative flavors) and UT line (performance, features, dual-tank tech) serve clearly different audiences. This is better brand architecture than most competitors, who offer a confusing stack of similarly-named devices.
Where Flum Falls Short
Retail availability is limited. Flum is harder to find in physical stores than RAZ or Geek Bar. If buying locally matters to you, Flum is a less convenient option. Online ordering from verified retailers like VapesOnlineShop is the most reliable way to get the full lineup. See our availability guide.
Brand split can be confusing. The Mello/UT/Float naming convention takes some effort to understand. "Float Mello Pro 50K" and "UT Bar Pro 50K" do not immediately communicate what makes each device different. New users may need our brand guide to navigate the lineup.
Discontinued products still dominate search. Flum Pebble and Flum Float were massively popular and still generate thousands of monthly searches — but they have been discontinued for over two years. New customers searching for these products may land on outdated information and not realize the brand has evolved significantly.
Per-device flavor depth is uneven. The UT 50K has 40 options and the Mello 20K has 33, but the Mello Pro 50K only offers 10. If your go-to flavor is not in the 50K's curated list, you are stuck with the lower-capacity Mello 20K for that flavor.
Flum vs the Competition — Brand-Level Comparison
| Dimension | Flum | RAZ | Geek Bar | Lost Angel |
|---|---|---|---|---|
| Current Devices | 4 | 5+ | 4+ | 3 |
| Total Flavors | 80+ | 100+ | 60+ | 23 |
| Max Puff Count | 50,000 | 50,000 | 25,000 | 50,000 |
| Unique Innovation | Dual-Flavor Switch | Per-device depth | AI Tuning | Detachable Battery |
| Price Range | $22.99–$24.99 | $18–$29 | $22–$27 | $23–$28 |
| Retail Availability | Limited | Wide | Wide | Moderate |
| VOS Brand Rating | 8.4 | 8.7 | 8.3 | 8.1 |
For a head-to-head deep dive with the top competitor, see Flum vs RAZ Vape.
Who Should Buy Flum
Flum Is Great For
- People who switch flavors frequently (UT 50K dual-tank)
- Flavor adventurers who want floral, city-themed, or seasonal options
- Budget-conscious vapers looking for the cheapest 50K-puff option
- Former Flum Pebble/Float users wanting the successor
- Anyone who values unique hardware features over brand ubiquity
Look Elsewhere If
- You need to buy in-store today (RAZ has better retail coverage)
- You want 50+ flavors on a single device (RAZ VUE 50K)
- You want a detachable/swappable battery system (Lost Angel Mate 50K)
- You want the latest screen tech (Geek Bar's 3D Smart Screen)
- Simple brand navigation matters to you (Flum's lineup is more confusing)
The Bottom Line
Flum earns an 8.4/10 brand rating primarily on the strength of the UT Bar Pro 50K's innovation and aggressive pricing across the lineup. It is not the biggest brand (RAZ), the most widely available (Geek Bar), or the simplest to navigate (Lost Angel). But it is the most creatively ambitious, the cheapest in the 50K tier, and the only one offering dual-flavor switching. If those things matter to you, Flum is worth your money.
FAQ
Is Flum a good vape brand?
Yes. VapesOnlineShop rates Flum 8.4/10 overall. It offers the only dual-flavor switching system on the market (UT Bar Pro 50K), the most creatively diverse flavor catalog (Mello 20K themed editions), and the best per-puff pricing in the 50K tier. Its main weaknesses are limited retail availability and a somewhat confusing product naming structure.
Which Flum vape should I get first?
For first-time Flum users, we recommend the UT Bar Pro 50K ($24.99). It has the most flavors (40), the unique dual-flavor system, and the best per-puff value. If you prefer themed editions and creative flavors, start with the Mello 20K ($22.99). See our Flum brand guide for a detailed decision framework.
Is Flum better than RAZ?
It depends on priorities. Flum wins on price (10-15% cheaper at 50K), innovation (dual-flavor switching), and creative flavor curation (themed editions). RAZ wins on total flavor count (100+ vs 80+), retail availability, and per-device flavor depth (50+ per device). For the full comparison, see Flum vs RAZ Vape.