Refilling BCA Airbag Backpacks

Post by blogger | May 4, 2011      

BCA avalanche airbag backpacks have a user refillable air cylinder. This feature allows you to refill your spent cylinder and get back on the slopes without delay or shipping costs. (If you don’t want to refill it yourself, you can always exchange it for a full one through the mail.) While this process may appear complex, once you’re used to it and have a good place to get the compressed air, you can do a refill quite easily and in a matter of minutes. Note that early versions of BCA’s system were hard to trigger, but this has been fixed. All improved “easy pull cylinders” are marked as such or have a gray colored cylinder head (not black). For our reports on the refill process for other brands, please see our index of Avalanche Airbag blog posts.

Here, the BCA Float 30 backpack has been inflated. In order to use it again, you will need to deflate and repack the airbag, and refill the cylinder.

The valve is accessed inside the pack. Lift up the orange flap and push the button in- out comes the air.

Compress all the air out, fold the bag along the existing creases and then fold accoridian style into the pack.

It's a tight fit and you may need to distribute the bag evenly to get the velcro to completely close. New packs use a zippered closure which is easier.

Now, you can disconnect the cylinder. Start by unscrewing the trigger cover, that's the one on the right.

With the cover off, you can then unscrew the trigger cable nut. The air hose quick connect is next.

With the cylinder removed and disconnected from the bag, grab your refill kit. It should include a hex wrench, toothpick, grease, and 5 o-rings. Bravo to BCA for including the kit for free with your pack.

Unscrew the two hex screws, separating the trigger housing from the cylinder head. Note the easy pull kit sticker, which is on all new cylinders. If yours doesn't have this, call BCA to upgrade.

With both screws removed, you must pull on the trigger pin in order to pull the housing up and off the cylinder head.

This picture shows why the trigger pin must be pulled before the housing will lift off. It sticks into the slot on the valve stem.

Pull the valve stem out of the cylinder head. Check for damage or scratches.

Remove and replace the little o-ring with the included toothpick. Check the big o-ring for damage, but leave it on. Wipe off the old grease with a rag, being careful to not scratch anything.

Grease up a new o-ring and put it on the valve stem.

O-ring slips into place. Apply grease to the big o-ring and the rubber washer.

Re-install the valve stem and trigger housing, making sure that the housing points in the right direction. The trigger should face the same direction as the air hose coupler, not the fill nipple. Don't over torque the screws, they don't need to be very tight.

You’re done with the assembly part, now the cylinder is ready to be filled. This can be done at one of four places: some licensed retailers, a paintball shop, a dive shop, or a fire station. You cannot do this at the gas station or on a construction compressor as you need 2700 psi of air! The head comes with a paintball fill fitting, so that’s the easiest route, but beware that paintball shops may not be good about keeping their air dry, which is very important. Dive shops require a paintball to SCUBA adaptor, have dry air, and should be very willing to fill your cylinder in the slow winter months if they are open. Fire stations require a paintball to SCBA adaptor and also have dry air. My experience is limited to fire stations, which is a great option as they should do it for free, every town has one, and they’re often open 24/7. However, it’s a mixed bag as far as how willing they will be to do it. Some stations will even change their minds (Aspen would do it a few years ago, but not anymore), so be sure to be courteous and perhaps consider a donation of some form (although this should be a free community service- you pay taxes right?) to keep them happy. A fifth option could be a ski patrol that uses the packs, but I haven’t tried and am not sure how involved in this they would want to get.

Cylinder with SCBA adaptor attached.

Whoever you have do it, have them fill the cylinder slowly (to avoid overheating) to 2700psi. Let them know that there is a check valve in the cylinder assembly, so when they unhook the adaptor, the air will stay in (I’ve had some confusion with that one). The cylinder will be hot, so you must cool the cylinder to room temp and then top it off. The reason for this is that gas expands when it is hot, so when the cylinder cools, the volume will drop. The cylinder gauge must read 2700 psi at room temperature. A water or snow bath will work, or just wait a couple hours. If you over fill the cylinder, there is no bleed valve, so to release some air you’ll have to release all of it.

My favorite method to cool the cylinder is to fill a Nalgene half full with water. Bring it with you to the filling place and it should get it cool within a few minutes.

Bonus: For air travel, you unfortunately cannot bring a filled cylinder on board. You must remove the cylinder head from the cylinder body so that security can look inside. Make sure to take these apart before you get to the airport, and keep them that way until you reach your destination. Goes without saying that this should only be done with an empty cylinder! The head should screw off easily by hand, if you encounter resistance, a wrench may be necessary. When you reach your destination, screw the head back on by hand, not too tight. You will then have to fill it, so be sure to have an idea on how you will do this wherever you end up.

BCA head removed from cylinder.


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19 Responses to “Refilling BCA Airbag Backpacks”

  1. Dave Reed May 5th, 2011 9:29 am

    The full list of certified refill centers can be found here:

  2. Nick May 6th, 2011 9:21 am

    NIck, thanks for the review. Just a quick heads up: it is possible to take full cylinders on planes in checked luggage with some pre-planning. It’s best to contact the airlines several days before the flight and to provide the following document, which is available on the BCA web site under “FAQ’s” for the Float airbags:

  3. Nick May 6th, 2011 4:26 pm

    Nick, have you tried that yourself? For US air travel, TSA has the following restrictions on their site:

  4. Lou May 6th, 2011 4:34 pm

    Ever tried to figure out their regulations for carrying batteries? Confusion about compressed gas _cartridges_ is nothing in comparison.

    In any case, I can not imagine they’d let a cylinder of compressed gas in any airline luggage, checked or unchecked. I mean, how would they even know what gas was in it?

  5. onyourleft May 9th, 2011 7:07 am

    Just checked this link:

    The full list of certified refill centers can be found here:

    Great to know I can get my cylinder refilled in North Dakota, but apparently no place in California…


  6. Bernard April 5th, 2014 2:36 pm

    Just got mine filled at the local scuba shop. They overfilled even though I told them about topping off. It’s reading a little over 2900 psi right now. I’m guessing it’s not a good idea to do my first test run with that pressure? If not, how do I release the air. That seems like a really basic question, but I can’t for the life of me figure it out.

  7. Nick Thompson April 5th, 2014 5:56 pm

    Hey Bernard, I think you’ll be fine deploying it at that pressure. I’ve shot my packs off at higher than the recommended pressures. You’re right, the only safe way to release the air is all at once and in the airbag, not by itself.
    If you’re concerned, you could always put the cylinder in the fridge for a little while. A lower temp will drop the pressure. Then trigger it in the airbag.
    Or, contact BCA.

  8. Daniel April 6th, 2014 3:29 am

    We have flown several times with ABS and Mammut RAS airbag systems. Airline was SAS (Scandinavian). As most Euro Airlines, Airbag Cartridges are no problem. The actual Probem ist not the airline but the security staff who are not airline staff. once missed a flight when one of our checked baggage got pulled out. Ever since we have taken Backpack and cartridge into carry on. Sometimes requires some discusson and explaining at security check, but at least you could always drop the cartridge and not miss the flight. We bring IATA documents and manufacturer manual every time. I recall things are much more strict in the US, right?

  9. Nick Thompson April 7th, 2014 8:35 am

    In the US, airport security must be able to see inside the cylinder with the cylinder head removed. They won’t permit a filled one or even an empty one with the cylinder head on.

  10. Andy M. April 7th, 2014 10:23 am

    I have traveled 3 times (once to Europe & twice to SLC) with my BCA bag/bottle since getting it this winter, and had zero issues following the procedures described here and on BCA’s site:
    *empty the cylinder
    *remove cylinder head
    *put cylinder head & bottle in clear gallon ziplock bag
    *put bag with bottle & head in separate tub from your pack while going through security
    *be prepared to explain to the security officers what it is and confirm that it is empty
    *make sure you bring the refill kit (spare o-rings, grease, toothpick, & hex wrench) to reseat (or replace) the o-ring after deploying the airbag to empty the cylinder

    The hardest part is finding a refill center that’s either open late the day of arrival or open early on ski day!

  11. Aaron April 2nd, 2015 1:13 pm

    Anyone have experience getting a Float cylinder refilled in Portland, OR? The BCA website lists only paintball shops in Gresham and Vancouver, WA as Refill Centers.

  12. NT April 2nd, 2015 1:22 pm

    Check out the mammut refill location list:

    If they can refill mammut, they can refill BCA- same thing just a different final pressure. (2700 vs 3000 psi)

  13. phil June 22nd, 2015 1:56 am

    thanks for the Info. how can you tell if a paintball shop has dry air. what sort of grease do you use.


  14. Simon November 22nd, 2015 1:15 am

    Hi Guys,

    Am based in France this year (in Paris) but will be doing plenty of trips to the alps. Does anyone know where cylinders can be filled over here? I have heard Chamonix?


  15. Matt December 15th, 2015 9:18 pm


    There are quite a few places in France to get a cylinder filled (or to have an empty cylinder replaced with a full one). Check the BCA Service Center Locator Map ( You can search for “Chamonix, France”, or wherever you happen to be going. There seem to be shops in most of the major ski resorts (Cham, Les 3 Vallées, Tignes, etc), as well as some smaller areas, and even just in random shops on the way up the valleys. There’s even 1 place listed in Paris, but I’m not sure if you’d have better luck at one of the other shops.

    Hope that helps,

  16. Simon December 16th, 2015 12:30 am

    Thanks Matt,

    I managed to get an exchange in Paris at Aux Vieux Campeur and am headed Andermatt this weekend.

    Looks like being a very lean Christmas over here in terms of snow though but it never hurts to have extra protection!


  17. Matt December 16th, 2015 8:51 am


    Glad you were able to find a shop to get a cylinder. I’m flying into GVA (and then on to Cham, maybe La Clusaz, etc) in early February, so I’m hoping the snow depth gets a bit deeper by then. I’m going to be doing a cylinder exchange while I’m there (since I’ll have to fly with any empty one since I’m flying from the US).

    Enjoy Andermatt,

  18. Giuseppe February 1st, 2017 9:00 pm

    Hey thank you for the instrunctions. Just one question…what if the cylinder is empty but new? Do i have to pull up the valve stem? Do i need to do anything with the trigger or it can be filled directly?


  19. Eric Simmons March 13th, 2017 2:51 pm


    your cylinder can be filled directly, as the air goes in it will seat the trigger in the closed position and will be ready for use when full.


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