The oxygen provider supplies backpacks for these bottles. It's on of two ways people who are on oxygen full time carry them.

I live on the seacoast near Galveston

BADASSERY of the highest order, I salute you and envy your commitment

15". I was thinking you'd have to have it at an angle with the top of the bottle sticking out the end anyway. Maybe shape the bottom with a towel to support the bottle.

A Basket up front will take that bag off your back when on the Bike
Front Baskets - Waldsports

I met Roy age 84 on a trike with walker and a battery powered oxygen machine. He was going South on Highway 3

You might be Much safer on a trike

Roy

Something to think about:

As an EMT we were always taught to not place the bottle in any position that would cause the regulator to be damaged in case of a fall or accident,e.g., lay the bottle down, don't stand it up on its bottom. If the regulator is damaged enough to leak, it can be like a rocket with 2200 psi of pressure.

"Oxygen cylinders need to be secured in a special base to keep the cylinder from falling over. The weight of the cylinder can damage property and people if it were to fall on something or someone. The cylinder valve could also be knocked off if the cylinder were to fall over. The high pressure coming out of the valve opening could then cause the cylinder to move about the room in a destructive, uncontrolled manner."

If it is firmly attached to the bike or in a secure trunk bag, it may not be a problem. However, if you crash hard enough to damage the regulator, the tank is probably the least of your worries.

Having said all that, I think it is very unlikely. I have never heard of this happening, and have been in situations where oxygen tanks were really treated roughly.

Your efforts, and drive are to be commended. Keep up the good work, and I'm sure you will figure something out.

This sounds to me to be a great idea when mounted on a rear rack, provided that the tank you mentioned is a diameter mentioned in the two sizes. It would probably be ideal if you could affix the bracket slung along the top tube or up the seat tube - but I'm not sure your tank would fit either of those places.

My opinion is: that while mounting on a front rack would give you better access to change delivery volume if the tank were mounted there, the weight of the tank may negatively affect your handling, even at moderate speed. You or someone handy could fashion a platform on top of the rear rack with two of these brackets, so you could take a spare tank.

I worry about the change in the bike's center of gravity for all the solutions though. I give care to a younger man (56) on oxygen, and my idea for him was to use a trailer to carry a tank or tanks - this would not change the balance of your bike, only make it a little more work to pedal.

Several companies make backpack or hip pack carrying cases for oxygen concentrators. Concentrators are relatively light and can last quite a while on a single charge. See if your doctor can work with your insurance company.

Would something like this work:

https://www.modernbike.com/product-2...FQmVfgodekMDUQ

I'm late to the party but it sounds to me like you need the borrle cage that I see advertised in the back of "Bicycling" and "adventure cycling" magazines, it will adjust to hold a wine bottle, i'd think that's large enough if it's strong enough

Finally an issue to which I can speak with some authority. I have been commuting with oxygen bottles for 11 years (39 mi RT for 10 years, last year in new location 25 mi RT). What I did was to go to a sheet metal shop and have them build me a frame. Basically just a strip of aluminum with the bottom folded up to make a base for the tank and the top folded down. The top has a hole cut in it to through to accommodate the neck of the bottle. Holes are drilled through the sheet metal holder to allow it to be bolted to the frame and attached with u-clamps to a standard rear rack. One of these on each side of the bike and a spare bottle held to the top of the rack with bungee cords.

It works. Issues are: most rear racks are flimsy, particularly where they attach to the frame under the seat. I had two heavy duty (solid) aluminum rods for this purpose. The rig is bit noisy (people will hear you coming). You'll need to inspect the mounting from time to time. The bolts shear off about once an year! And 3 oxygen bottles are heavy, so you'll need to buy yourself a Suley cross-check to carry it all.

Finally, remember that the cannula goes outside your earphones and helmet, or you'll rip your head off when you go down.

A better photo

Take a look at this article it gives multiple options for mounting over sized bottles/containers to bikes.

All About Oversized, XL and Anything Bottle Cages - CyclingAbout