PAX Flow Review: The PAX That Actually Blows Clouds

The PAX Flow has the most open airflow PAX has ever made. It uses hybrid heating, charges fast over USB-C and lets you haul on it instead of sipping slowly like older PAX models. The trade-offs are battery life and heat. I got 4 to 5 sessions per charge, and it gets really hot by the end of a session. It’s also not the hardest-hitting PAX. When I hit it back to back with the PAX 4, the PAX 4’s clouds were denser. If you want a wide-open draw, a Bong Mode and fast charging, the Flow is a great pick. If you want the thickest clouds, I’d get the PAX 4.

The Flow came out in 2025. It’s the heaviest PAX, but it still fits in your pocket and still runs on one button. If you already know it’s for you, you can shop the PAX Flow here.

The Flow has four main heat modes plus a hidden fifth one, all shown by the LED petals:

• Petal 1 (Purple): 356°F / 180°C. Light vapour for discreet sessions.
• Petal 2 (Green): 374°F / 190°C. Stretches your herb over a longer session.
• Petal 3 (Yellow): 392°F / 200°C. Good flavour with smooth vapour.
• Petal 4 (Orange): 419°F / 215°C. The most vapour of the four main modes.
• Bong Mode (Multi-Colour): 437°F / 225°C. Made for hitting it through a water pipe.

To change modes, quick press the button while it’s on. The mode locks in after about 3 seconds or as soon as you shake it.

Bong Mode is hidden. Cycle through all four heat modes twice and the petals light up in multiple colours. It’s designed to be used with PAX’s water pipe adapter, which is sold separately.

The big change with the Flow is the airflow.

Older PAX models used conduction heating only, so you had to sip slowly. If you pulled too hard, you cooled the oven down and lost your vapour. The Flow uses hybrid heating, conduction and convection together, and the airflow is about 10 litres per minute. Older PAX models were around 1.5. You feel that difference on the first draw.

You can haul on it, and it keeps up. PAX’s own guide says “sip or rip,” and it means it. The vapour is smooth too. It reminds me of the Venty in that way, which also uses hybrid heating and puffs hard.

Going by the airflow numbers, I expected the Flow to be the hardest-hitting PAX. It isn’t. When I hit it back to back with the PAX 4, both on Orange, the PAX 4 put out denser clouds. The Flow’s draw is so open it almost feels like you’re pulling more air than vapour. It’s still a good weed vaporizer, and if you’ve only used older PAX models, you’ll be stoked with it. It just isn’t the cloud machine I thought it would be.

1. Fully charge it before your first session.
2. Press down on the circle to open the oven door.
3. Grind your herb medium to fine and gently pack it into the oven.
4. Close the door and install your mouthpiece.
5. Press and hold the button for 2 seconds. The petals glow pink while it heats.
6. Quick press to pick your heat mode, then wait 3 seconds or shake it to lock it in.
7. When the petals turn green, you’re ready. PAX says heat-up takes about 45 seconds.

A few extra controls are handy to know. Shake it any time to check the battery. To change the brightness of the petals, hold it sideways with both hands while it’s on. Rotate it away from you twice to make them brighter, or toward you twice to dim them. If it ever acts up, hold the button for 7 seconds to factory reset it.

It feels like a PAX: a smooth aluminum body, solid weight and a clean, simple design. The oven is stainless steel.

The biggest design change is the oven door. Instead of loading from the bottom like other PAX models, the Flow loads through a door on the side. Pop it off and you can reach both the oven and the airpath, which makes cleaning a lot easier.

I’m not a big fan of the side door, though. I like how the PAX 4 and older PAX models load from the bottom, which leaves less room to mess up. The magnet on the Flow’s door isn’t very strong, and the door doesn’t always go back on smoothly. My guess is PAX designed it this way to keep gunk out of the airpath. It’s not a deal breaker, and you get used to it.

In the box:

• PAX Flow device
• Oven door
• Flat mouthpiece
• Raised mouthpiece
• Multi-tool
• Oven screens (3 spare, plus 1 installed)
• Cleaning swabs
• USB-C charging cable

One thing to keep in mind is that the Flow uses its own screens and mouthpieces. Parts from other PAX models don’t fit it.

The Flow comes with PAX’s 2-year limited warranty. Register it on pax.com within 30 days of buying it and you get 2 more years, for 4 years total.

The Flow is the heaviest PAX, at about 10.7cm tall and 135g. You’ll definitely feel it in your pocket, but it’s not bulky or awkward, and it slides easily into a jacket or bag.

The oven holds about 0.3g. That’s smaller than some other PAX models, but I like it. I’d rather do two smaller sessions than pack one big bowl and be ready for bed halfway through.

PAX Flow vs PAX Mini 2: The PAX Mini 2 is much smaller and uses conduction heating, so it’s built for slow sips and maximum stealth. The Flow puts out far more vapour and charges with USB-C.

PAX Flow vs PAX 4: The PAX 4 also uses hybrid heating, in the classic PAX shape with bottom loading. Its draw is tighter, but in my back-to-back test it put out denser clouds, and it’s my favourite PAX. The Flow wins on airflow, charging speed, Bong Mode and warranty.

Still deciding? Our PAX comparison breaks down the Flow, PAX 4 and PAX Mini 2.

Battery life is the Flow’s weak spot. I ran it from a full charge until it died and got 4 to 5 full sessions, each running about 2 to 5 minutes. Lower heat modes will stretch it a bit, but don’t expect all-day use. The battery isn’t replaceable either.

The good news is that PAX finally switched to USB-C. You don’t need a special PAX charger anymore, so if you’re at a friend’s place or out for the day, you can charge it with almost any phone cable. It’s fast too. In my experience it fully charges in about 30 to 45 minutes.

If you want a spot for it at home, the PAX Flow Charging Dock keeps it tidy. If battery life matters more to you than size, the Venty lasts a lot longer per charge.

Day to day, the Flow is about as easy as vaporizers get. One button, quick heat-up and fast charging.

One tip: don’t leave old herb sitting in the oven. I noticed it gets a little wet inside after a session, and leaving it in there just makes everything dirtier. Give it 10 minutes to cool, then empty it with the multi-tool right away.

PAX recommends a full clean every 3 to 5 sessions:

1. Let it cool for 10 minutes, then remove the oven door.
2. Clear out the oven with the multi-tool.
3. Wipe the airpath and oven door with a swab dipped in isopropyl alcohol.
4. Soak the oven screen in isopropyl alcohol for about 15 minutes.
5. Let everything dry before putting it back together.

To swap a screen, press the round end with the multi-tool to eject it. Keep fresh PAX Flow Oven Screens on hand, and grab spare flat or raised mouthpieces if you share.

The Flow still looks more like a gadget than a vaporizer, so it doesn’t draw attention. Bigger pulls mean more vapour to clear, though, so stick to Purple or Green when you need to keep it low-key.

Before it goes back in your pocket, give it 10 minutes to cool down.

Heat. The Flow gets really hot. By the end of one session it gave me a bit of a jolt. It was toasty.

To be fair, every PAX gets hot, but it’s still the Flow’s biggest flaw. I wish PAX included a silicone case in the box. Until they do, a silicone sleeve helps a lot. Using a lower heat mode for longer sessions and setting it down between hits also helps. If it ever gets too hot, the petals flash red and orange and it shuts itself off.

Yes, if you want the most open draw PAX makes. The Flow keeps what works about PAX, like the simple controls and clean design, and adds hybrid heating, wide-open airflow, Bong Mode and fast USB-C charging. It’s a great device and I recommend it. Just go in knowing the battery is short, it gets hot, and the PAX 4 hits denser.

The PAX Flow is a great fit if you:

• Want a wide-open draw you can really pull on
• Plan to hit it through a bong
• Want USB-C charging you can top up anywhere
• Like simple, one-button controls
• Prefer smaller sessions

You might prefer something else if you:

• Want the thickest clouds. The PAX 4 hits denser.
• Need a battery that lasts all day
• Don’t like a device that gets hot in your hand
• Want to vape concentrates. The Flow is dry herb only, and I’m fine with that. I’d rather have one device for flower and a dedicated dab pen for concentrates.

Weighing it against other brands? Read our PAX vs Storz & Bickel comparison, or learn how hybrid heating works in our conduction vs convection guide.

Pros

• Much more vapour than older PAX models
• Most open airflow PAX has made
• Fast USB-C charging
• Bong Mode for water pipes
• Simple one-button control
• 0.3g oven, good for smaller sessions
• Easy to clean through the oven door
• 2-year warranty, plus 2 more when you register

Cons

• Only 4 to 5 sessions per charge
• Gets really hot by the end of a session
• Clouds aren’t as dense as the PAX 4
• Side-loading door with a weak magnet
• Heaviest PAX
• Parts from other PAX models don’t fit