Water pipes & bongs
by Hemper
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The Cauldron Bong is a themed glass water pipe from Hemper that filters your smoke through water for a cooler, smoother hit — while looking like something straight out of a witch's kitchen. Available in a 6-inch and a 9-inch version, it features a transparent black body, a bright green top, and a broomstick-shaped mouthpiece. It's one of those pieces that gets a reaction every time someone spots it on the shelf.
| Variant | Height | SKU | Best for |
|---|---|---|---|
| 6-inch | Approx. 15 cm | HS2370 | Compact sessions, easy storage, travel-friendly |
| 9-inch | Approx. 23 cm | HS2371 | Bigger hits, more water volume, smoother filtration |
The 6-inch version is the one you toss in a bag or keep on a crowded desk. The 9-inch gives you noticeably more cooling distance between the bowl and your mouth — if you have the shelf space, we'd pick the 9-inch every time. The extra water volume makes a real difference in how smooth each pull feels.
Most themed bongs sacrifice function for looks. You get a funny shape, a wobbly base, and a bowl that clogs after three sessions. The Cauldron Bong sidesteps that problem. The cauldron shape naturally creates a wide, stable base — wider than a standard beaker at the 6-inch size — so it actually sits more securely on a table than plenty of "serious" pieces we've handled. The transparent black glass has real depth to it; hold it up to a light and you can see the water level clearly, which is more than you can say for fully opaque novelty pieces.
The bright green top is genuinely vivid. It's not a decal or paint — it's coloured glass fused to the body, so it won't chip or fade after cleaning. The broomstick mouthpiece is the detail that ties the whole theme together. It's angled comfortably and has enough length that you're not hunching over the piece. Feels a bit odd in the hand the first time — it's thinner than a standard mouthpiece tube — but you get used to it within a session or two.
One honest limitation: the bowl that ships with the Cauldron Bong is on the smaller side. Fine for solo sessions, but if you're passing it around with mates, you'll be repacking frequently. A replacement bowl with a slightly larger capacity is an easy upgrade if that bothers you.
| Spec | Value |
|---|---|
| Brand | Hemper |
| Material | Borosilicate glass |
| Available sizes | 6-inch (HS2370) / 9-inch (HS2371) |
| Body colour | Transparent black |
| Top colour | Bright green (coloured glass) |
| Mouthpiece | Broomstick-shaped tube |
| Filtration | Water filtration (downstem diffusion) |
| Base shape | Wide cauldron — low centre of gravity |
| Joint size | 14mm female (standard) |
Complete your setup: pair the Cauldron Bong with a set of brass pipe screens to keep ash out of the water, and pick up a bottle of Formula 420 cleaner — resin builds up fast in themed glass with tight curves, and a proper cleaner saves you 20 minutes of scrubbing with salt and alcohol.
We've seen it dozens of times in the shop: someone picks up a novelty piece because it looks brilliant, uses it twice, and then it migrates to the back of the cupboard because the draw is too tight or the base tips over on any surface that isn't perfectly flat. Themed glass has a reputation problem, and it's mostly deserved.
The Cauldron Bong is the piece we hand to people who want something with personality but don't want to compromise on the actual smoking experience. The 14mm female joint means you can swap in any standard bowl or ash catcher. The downstem sits low in the cauldron body, so even a moderate fill of water — roughly 2-3 cm above the downstem slits — gives you proper diffusion. When you smoke from a bong, the water filters out particulate matter and certain toxins that you'd directly inhale using other methods, which is why water pipes remain the go-to for people who want flavour without harshness.
Compared to a standard straight-tube bong of the same height, the Cauldron Bong holds about 15-20% more water thanks to its bulbous base. More water means more surface area for smoke to cool before it reaches you. If you're choosing between this and a basic beaker, the Cauldron wins on stability and conversation value. If you want raw performance above all else, a percolator bong with multiple diffusion chambers will outperform it — but it won't look half as good sitting on your coffee table at a Halloween gathering.
Yes. The wide cauldron base gives it a low centre of gravity, so it's actually more stable than many straight-tube bongs of the same height. On a flat surface, it sits firmly. Just don't leave it on the edge of a table — glass is glass.
Technically yes, but you'd lose all the filtration and cooling benefits. Without water, the smoke hits your throat hot and harsh. There's really no reason to skip it — just pour in a few centimetres and you'll taste the difference immediately.
It uses a standard 14mm female joint, so any 14mm male bowl or accessory will fit. The included bowl works fine for solo use; upgrade to a larger 14mm bowl if you want bigger packs for group sessions.
The mouthpiece tube is narrow, so a thin pipe cleaner or flexible brush works best. Soak it in isopropyl alcohol for 10-15 minutes, run the brush through a few times, then rinse with warm water. Do this after every 3-4 sessions to prevent resin buildup.
When you inhale, smoke is pulled down the downstem and forced through water. The water traps heavier particulate matter and cools the smoke before it reaches your lungs. The result is a smoother, cooler hit with more flavour than dry methods.
No. The green section is coloured borosilicate glass fused to the black body during production. It won't peel, chip, or wash off with cleaning — it's part of the glass itself.
The 6-inch is compact and easy to store — good if space is tight or you want something portable. The 9-inch gives noticeably smoother hits thanks to more water volume and cooling distance. If you mostly smoke at home, go with the 9-inch.
Last updated: April 2026
