The Flum Mello 20K is the spiritual successor to the wildly popular Flum Pebble — same pebble-shaped comfort, but upgraded to 20,000 puffs, a Hybrid 2.0 Mesh Coil, and a Mega HD Animated Screen. At $22.99, it is the cheapest device in the Flum lineup and the entry point for anyone new to the brand. But the real selling point is the flavor curation: 33 flavors organized across 6 themed editions, including floral and city-inspired profiles you will not find from any other brand.
After testing the Mello 20K across multiple editions and flavors, here is our honest take — including where it falls short compared to competing devices from RAZ and Geek Bar.
What We Like
Unmatched flavor creativity. No other disposable vape offers themed editions like City Series (mint-based flavors named after European cities), Floral Delights (actual floral notes in a vape), and Valentine/Christmas seasonal specials. The 33-flavor lineup across 6 editions gives the Mello 20K the most creatively diverse catalog we have seen from any single device at VapesOnlineShop. Standout flavors include Midnight Barcelona (grape-aloe-mint), Velvet (red velvet cake), and Vienna Bliss (strawberry cream with cooling finish).
The animated screen is genuinely useful. The Mega HD Animated Display is not just a gimmick — it shows battery level, e-liquid remaining, and puff count with themed animations that match each edition. It is the best screen on any Flum device and more visually engaging than the UT Bar Pro 25K's Galaxy LED.
Comfortable design that echoes the Pebble. The translucent PC material and pebble-like shape make this one of the most comfortable disposables to hold during extended sessions. If you loved the Flum Pebble's form factor, the Mello 20K is its direct evolution.
Lowest entry price. At $22.99, it is $1–2 cheaper than every other Flum device and undercuts most competing 20K-class vapes.
What Could Be Better
Per-puff value is the weakest in the Flum lineup. At $1.15 per 1,000 puffs, the Mello 20K costs more than double per puff compared to the 50K flagships ($0.50). For just $2 more, the Float Mello Pro 50K delivers 2.5x the puffs. If budget-per-puff matters, the 20K is the least efficient choice.
650 mAh battery requires frequent charging. With 20,000 puffs and a 650 mAh battery, you will need to charge 8–12 times over the device's lifespan. Heavy users may find themselves charging daily. The 50K models handle this better with larger batteries. See our charging guide for tips.
Some themed edition flavors are niche. Floral Delights and City Series are creative, but flavors like Blossom (pure floral) and Vol.5 (pure freshness) are polarizing — some users love them, others find them off-putting. The Standard Edition is the safer bet for mainstream palates.
No turbo or adjustable mode. Unlike the Float Mello Pro 50K (Turbo/Eco) and the UT 25K (Smooth/Turbo), the Mello 20K has a single fixed output. You cannot adjust vapor intensity.
How It Compares
| Feature | Flum Mello 20K | Mello Pro 50K | RAZ DC 25K |
|---|---|---|---|
| Puffs | 20,000 | 50,000 | 25,000 |
| Flavors | 33 (6 editions) | 10 | 25+ |
| Screen | Mega HD Animated | HD | LED |
| Price | $22.99 | $24.99 | ~$24-26 |
| Best For | Flavor explorers on a budget | Long-lasting proven flavors | Feature-rich mid-range |
Who Should Buy the Mello 20K
The Mello 20K is ideal for flavor explorers who enjoy rotating between different profiles, former Flum Pebble users looking for an upgrade, and anyone who wants to try Flum at the lowest possible price point. It is not the best choice if per-puff value is your primary concern — for that, spend the extra $2 on either 50K model.
FAQ
Is the Flum Mello 20K worth it?
For flavor variety and design aesthetics, yes — no other 20K-class device offers 33 flavors across themed editions with an animated screen at $22.99. For pure per-puff value, the 50K models are a better deal. It depends on whether you value creative flavor curation or cost efficiency.
How long does a Flum Mello 20K last?
For an average user taking 200–400 puffs per day, the Mello 20K lasts roughly 7–14 days. Heavy users (500+ puffs/day) may go through it in 5–6 days. The 650 mAh battery needs charging every 1–2 days depending on usage.