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What Is a Gravity Bong and How Do You Make One?

April 25, 2017
A gravity bong is a cannabis consumption method that uses two empty plastic bottles to funnel smoke through water and push it into the consumer’s lungs. Gravity bongs work by submerging a small bottle with a bowl of cannabis on top in a larger bottle or bucket of water. While lighting the cannabis, slowly draw the bottle out of the water to fill with smoke from the burning cannabis. Unscrew the lid, put your mouth over the bottle’s opening, and push the bottle down to let gravity propel the cannabis smoke into your lungs. Voila!

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Do gravity bongs get you higher? The short answer is yes. Gravity bongs force heavily concentrated smoke into your lungs, filling them to capacity beyond the average hit from a pipe or joint. When you inhale the contents of the smoky bottle into your lungs, you are essentially breathing in the smoke from an entire bowl of cannabis in one go. For this reason, gravity bongs are certainly not for the faint of heart. A tried-and-true method of old school cannabis consumers, it delivers a powerful hit of THC that may be too much for an inexperienced cannabis beginner.

However, if you’re looking for a bit of nostalgia and feel like getting crafty with your cannabis consumption, here’s a handy guide to creating your own gravity bong using a few everyday household objects.

Disclaimer: Inhaling combustible materials from a plastic smoking device may be hazardous to your health. Proceed at your own discretion!

How to Make a Homemade Gravity Bong

How to make a gravity bong out of a water bottle: gather all the items needed

First, gather the following items:

  • Plastic bottle (any size, but 16-20 oz is ideal)
  • Bucket or 2-liter plastic bottle
  • Aluminum foil
  • Box cutter or sharp knife
  • Poking device
  • Cannabis strains of your choice (at least one gram)

Gravity bongs can be a bit intimidating if you don’t know where to start, but the procedure is more straightforward than you might imagine. It just requires a little ingenuity, some creative efforts, and the determination to make it work.

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Step 1

How to make a gravity bong out of a water bottle step 1: Cut the water bottle

Use your box cutter to cut the bottom off your smaller bottle. The more of the bottle that remains, the larger the hit you’ll receive, so be careful not to trim too much off the bottom of the bottle.

Step 2

Cut the bottom off your larger 2-liter bottle and fill it with water. If you’re using a bucket, fill your bucket with water.

Step 3

How to make a gravity bong out of a water bottle step 3: make a hole in the bottle cap

Unscrew the cap to your smaller bottle and use your box cutter or scissors to make a hole in the bottle cap. It should be big enough to draw air through, but not so big that the foil (and cannabis) will fall through into the water.

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Step 4

Wrap the cap in aluminum foil, shaping the foil to create a small “bowl” divot for your cannabis. You can shape the bowl to be as deep as you’d like, and the foil will keep your cannabis from falling into the water below. You may need to cut off excess foil and shape it to avoid spilling cannabis. Health hack: if you’re looking to spare your lungs, try this metal bowl piece specifically designed to be used for gravity bongs.

Step 5

how to make a gravity bong out of a water bottle step 5: make holes in the aluminum foil

Use your sharp poking tool to make holes in the aluminum foil. Be careful not to rip the foil! You’ll need about 3-5 holes for proper ventilation.

Step 6

Load cannabis strains of your choice into the foil-wrapped bottle cap, but don’t screw the cap on yet.

Step 7

how to make a gravity bong out of a water bottle step 7: submerge bottle into water

Here’s the tricky part: Submerge the smaller bottle in the filled bottom half of the larger bottle (or bucket) until just the cap remains above water. Carefully screw the foil-wrapped bottle cap back onto the bottle.

Step 8

Light the cannabis and slowly pull the smaller bottle upwards out of the water while the bottle fills with smoke. If the bottle doesn’t fill with smoke, you may need to check and make sure that your cap is fully screwed on, and that there are no holes or gaps in the side of the bottle. Any leaks could compromise your gravity bong, and some trial and error may be required before your first successful attempt at a functional device.

Step 9

How to make a gravity bong out of a water bottle step 9: unscrew cap and smoke it

Once your bottle is filled with smoke, carefully unscrew the cap and put your mouth over the bottle opening.

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Step 10

Gently push the bottle back into the water. As the water enters the bottle, the smoke will be pushed into your lungs.

The cannabis smoke will be cooler, having been filtered through the water, but it will deliver a powerful hit of THC. For best effects, prepare yourself and don’t force yourself to inhale too much smoke. This has the potential to make even the most veteran of cannabis consumers cough, so proceed with caution!

Lisa Rough's Bio Image

Lisa Rough

Lisa is a former associate editor at Leafly, where she specialized in legislative cannabis policy and industry topics.

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  • Graham Green

    I can’t believe a big site like Leafly would suggest to people to smoke out of aluminum foil. I know it’s not as bad for you as we once thought it was, but still – it’s not GOOD for you.

  • Mike Bernard

    We were doing these back in the 80’s. We called them Depth Charges.

    Ask me nicely and I’ll tell the story of how I built a smoking helmet out of an old beer ball. 😉

    • Ha Ha Ha that’s some funny shit. None 4 me…ho ho too messy, Puh-Leeeze. If it got me higher I’d smoke out of a fresh turd lol (thank God no one suggested it back in the day) and Really?!? Who hasn’t smoked outta foil?!? I’ve probably smoked more bud outta foil than anything else lol. I’d be more inclined to believe that what I was smoking could cause dementia rather than what I was smoking it out of. it’s not like making a bowl out of copper and smoking out of it. My Father, may he Rest in Peace, passed away from Alzheimer’s and he never smoked anything. I wanna party with Mike and check out the beer ball smoking helmet, I’m gettin a visual and it seems like there would be a lotta wasted smoke, unless you’re a Sasquatch I don’t see ya clearing it lol. Party On Mike Bernard. https://uploads.disquscdn.com/images/f728b29f527138b30d7480c7d141083fc571a67d56e881e53f5c0c091d98359e.jpg

      • BIPOLAR BABIE

        I CONCUR

  • lovingc

    None for me thanks. Sounds very messy.

  • Ha Ha Ha that’s some funny shit. None 4 me…ho ho too messy, Puh-Leeeze. If it got me higher I’d smoke out of a fresh turd lol (thank God no one suggested it back in the day) and Really?!? Who hasn’t smoked outta foil?!? I’ve probably smoked more bud outta foil than anything else lol. I’d be more inclined to believe that what I was smoking could cause dementia rather than what I was smoking it out of. it’s not like making a bowl out of copper and smoking out of it. My Father, may he Rest in Peace, passed away from Alzheimer’s and he never smoked anything. I wanna party with Mike and check out the beer ball smoking helmet, I’m gettin a visual and it seems like there would be a lotta wasted smoke, unless you’re a Sasquatch I don’t see ya clearing it lol. Party On Mike Bernard. https://uploads.disquscdn.com/images/44e8da051d918cb8d2f7f2cebe0edbab60a4a69a1617868b7d9638cc63d785c6.jpg

  • Rollinman1

    We were building these things in the late 70’s. first of all use a plastic bottle with a snap off lid such as a half gal. milk jug or juice bottle, this will make it easier to remove the lid when ready to inhale. second use a one hitter bowl from an old bong! this is so you don’t spill all of your precious commodity on the floor or in tub water, or burning plastic or foil. put a hole in the lid to fit your bowl careful make hole just big enough to screw bowl into. next use ice in your tub water for a smoother hit! these are my old school methods. enjoy hope this is helpful for all you younger adults out there!

  • mf2112

    If you are pushing down then it isn’t gravity forcing the smoke into your lungs.

    • Owen Miller

      According to special relativity its actually the same. you cant differentiate a force pushing you up or pulling you down.

      • mf2112

        Special relativity only is applicable at speeds approaching the speed of light, so no, sorry.

        • João Freitas

          As a physicist, I can guarantee you it works for low speeds too, so yeah, sorry.
          And also, he was talking about General relativity, based on the equivalence principle. But special relativity still applies, but if speeds are low, then the results actually approximate to Newton’s/Galilean.

  • Tyler

    This is horrible advice! Aluminum foil and plastic right under the bowl piece? Come on Leafly… the wellbeing of uninformed people is in your hands, please do not poison a new generation of cannabis users!

    • ❄❄ Ezri Dax ❄❄#NRABOYCOTT

      plus pulling smoke on top of water will not cool it

  • FlunkedAgain

    Gravity? No way. The first step produces a vacuum. Pushing down on the bottle produces pressure.

    The cannabis smoke is not filtered through water.

    This should be called a Water Piston Bong.

    • Butch420

      So it’s basically like using a spoon pipe

  • Роман Шаповалов

    this method is very simple and effective, and it also requires a small amount of weed.
    also it is better to use a self-made “cap” instead of a foil, all you need is wine cork and thimble with holes inside.Here in Eastern Europe we call it “naper” https://uploads.disquscdn.com/images/6ecd12bffea207e1098441b84e5ee1b76a663c012107d78b0d10cd1c4a49d794.jpg

  • Mike Bernard

    In the 80’s we called this a Depth Charge.

  • Captainllama


    The cannabis smoke will be cooler, having been filtered through the water…”- At no point has the smoke been filtered through the water

  • DaWeedMan

    Forget foil, in Delaware we use sockets from socket wrenches to contain the weed then cut the bottle cap with an X mark big enough to snugly fit the socket holding the weed.

    Holds the weed safe.
    Perfect design.