Water pipes & bongs
by Hemper
The UFO Vortex Bong is a 7-inch glass water pipe that turns every hit into a swirling vortex of smoke, pulled upward through strategically placed Venturi holes into a flying saucer-shaped glass chamber. Made by Hemper, this compact bong prioritises design and smooth filtration over sheer size — and honestly, watching the smoke spiral through the UFO disc is half the fun. Available in four colourways: Teal, Blue, Green, and Transparent Black.
| Variant | SKU | Vibe |
|---|---|---|
| Teal | HS2451 | Muted blue-green — the subtlest of the four |
| Blue | HS2452 | Classic deep blue, shows smoke contrast nicely |
| Green | HS2589 | Forest green — looks good on a shelf |
| Transparent Black | HS2450 | Smoked glass, slightly harder to see the vortex but looks sharp |
Quick note: if you want to actually watch the vortex effect in all its glory, go with Teal or Blue. The Transparent Black looks brilliant but the darker glass makes the swirl a bit less visible. Trade-offs.
| Spec | Detail |
|---|---|
| Brand | Hemper |
| Height | 7 inches (approx. 18 cm) |
| Material | Glass |
| Percolation type | Venturi holes (vortex effect) |
| Feature | Glass UFO disc chamber |
| Variants | Teal, Blue, Green, Transparent Black |
| Joint type | Standard bowl included |
| Category | Water pipe / bong |
Complete your setup: grab a set of pipe screens to keep ash out of those Venturi holes, and a bong cleaning solution — glass this good-looking deserves to stay clear. A grinder card or herb grinder also pairs well, since evenly ground material gives you better airflow through the bowl.
Most bongs this size are afterthoughts — basic straight tubes with a carb hole and nothing else going on. The UFO Vortex is different. Hemper built actual engineering into a compact frame: the Venturi holes at the base of the chamber create a pressure differential that forces smoke into a tight, spinning vortex as it rises. That vortex then feeds directly into the glass UFO disc, where the smoke spreads out and cools before reaching your mouth. The result is a noticeably smoother hit than you'd expect from something that fits in one hand.
We've handled a lot of small bongs over the years, and most of them hit harsh because there's simply not enough distance or filtration between the bowl and your lungs. The Venturi design on this one actually compensates for the short path. It's not going to match a 14-inch beaker with a tree perc — nothing at 7 inches will — but for its size class, the filtration is genuinely impressive. The smoke tastes cleaner and arrives cooler than a standard mini bong.
The honest limitation? It's small. That means less water volume, which means you'll want to change your bong water more frequently — every session or two, ideally. Small bongs also tip more easily on a table, so be mindful of placement. The glass UFO disc adds some visual weight to the top half, which doesn't help stability. Treat it with a bit of care and it'll last. Knock it with your elbow while reaching for the remote and, well, it's glass.
The Venturi effect is a principle from fluid dynamics: when air (or smoke) passes through a constricted opening, its speed increases and pressure drops. Hemper placed small holes at strategic points inside the bong's chamber. As you inhale, smoke is pulled through these narrow openings at higher velocity, creating a spinning motion — the vortex you can see through the glass walls.
This isn't just for show, though the visual is admittedly mesmerising. The spinning action increases the surface area of smoke in contact with water, which means more particulate matter gets filtered out and the smoke cools more efficiently. Think of it as getting percolator-level diffusion from a design that doesn't rely on a traditional perc tree or honeycomb disc. Fewer internal glass parts also means fewer things to break and fewer crevices to scrub during cleaning — a genuine practical advantage at this price point.
Compared to a standard diffused downstem bong of the same height, the UFO Vortex delivers noticeably less drag. The Venturi holes don't restrict airflow the way a packed diffuser can. You get smooth filtration without feeling like you're sucking a milkshake through a coffee stirrer. If you've been put off small bongs because they tend to hit tight and hot, this one's worth a second look.
Glass bongs stay beautiful exactly as long as you bother to clean them. With the UFO Vortex, the Venturi holes are the critical area — resin builds up around small openings faster than on flat glass surfaces. Here's what works:
One thing we'd flag: the UFO disc at the top can trap a thin film of residue on its underside. It's tricky to reach with a brush. Soaking the whole piece in isopropyl for 30 minutes handles it. Don't use boiling water — thermal shock can crack glass, especially around the thinner sections of the UFO disc.
A basic 7-inch straight tube bong does one thing: holds water and lets you pull smoke through it. There's no percolation beyond whatever the downstem provides, and at this height, the smoke barely has time to cool. They work, but they're nothing special.
The UFO Vortex adds two layers of engineering. First, the Venturi holes create active diffusion — the smoke spins and breaks into smaller particles, increasing water contact. Second, the UFO disc acts as a splash guard and secondary cooling surface. The combination means you're getting filtration that normally requires a taller bong with a dedicated percolator.
The trade-off is that the UFO Vortex has more internal glass structure, which means slightly more effort when cleaning. A straight tube you can rinse in 20 seconds. This one needs a proper soak once a week. For most people, the smoother hit is worth the extra 5 minutes of maintenance. If you genuinely can't be bothered with cleaning, a simple beaker bong might suit you better — but you'll feel the difference in smoke temperature and taste.
Venturi holes are small openings positioned inside the bong chamber that constrict airflow, increasing smoke velocity and creating a spinning vortex. This vortex increases the surface area of smoke exposed to water, resulting in better filtration and cooler hits than a standard open chamber design.
Not with the right design. A plain 7-inch tube can hit harsh, but the UFO Vortex Bong compensates with Venturi percolation and the UFO disc chamber. You won't get the same volume as a full-size beaker, but the smoothness per hit is surprisingly close. It's also far easier to store and travel with.
Fill until the Venturi holes are submerged by about 1–2 cm. If water reaches your lips when you inhale, you've overfilled. Start low and add small amounts until the vortex forms cleanly without splashback.
Yes. Any form of percolation — whether it's a tree perc, honeycomb, or Venturi holes like in the UFO Vortex — breaks smoke into smaller bubbles. More bubbles means more water contact, which filters out more particulate and cools the smoke. The difference is noticeable even on the first hit.
Diffusion is the filtration effect — smoke breaking into bubbles and cooling through water contact. Drag is the resistance you feel when inhaling. Heavy diffusion (lots of small holes) usually adds drag. The Venturi design on the UFO Vortex keeps diffusion high while minimising drag, because the holes accelerate airflow rather than restricting it.
Rinse with hot water after every session. Do a full clean with coarse salt and isopropyl alcohol at least once a week. Small bongs accumulate resin faster than large ones because there's less glass surface area to spread it across. Neglect cleaning and you'll taste it within 3–4 sessions.
It's designed as a dry herb water pipe. You could technically swap the bowl for a banger or nail, but at 7 inches, the vapour path is very short for concentrates. You'd get better results from a dedicated dab rig. Stick to herb with this one — that's where it shines.
Last updated: April 2026
