There is yet another alternative to tanks and cylinders which is really a portable oxygen concentrator arrived on the scene around a decade ago.

Oxygen concentrators change from tanks and cylinders, in that they do not store oxygen, either as compressed gas or in liquid form, but instead extract it from the encompassing air.
This has caused a number of advantages and benefits, both in the portable devices and stationary ones.
Benefits of portable oxygen concentrators:
Perhaps the most important one relates to how long the oxygen lasts. As they're not containers they don't store oxygen, and for that reason it doesn't run out. They run on electric power, either directly plugged in or with a rechargeable battery. How long it lasts depends on access to its power source.
https://intensedebate.com/people/puppyhoe31 is that they need not be refilled. Normally this might mean having to send off the tanks for a refill.
There are a number of different makes and models ideal for just about any kind of activity. The new range of portable oxygen concentrators are centered on user needs. https://www.metooo.com/u/65dc7397177b1830a241b1c6 means that they are smaller, weigh less and the rechargeable batteries are lasting longer. That is excellent news or both for the day-to-day activities as well as for travel possibilities.
In respect to visit the FAA has authorized the utilization of around 14 the latest models of of portable oxygen concentrators aboard planes that travel over US airspace. Travel by air, by car, by coach and by train is currently much easier.
Oxygen is not flammable nature but it does feed flames, so apart from standard precautions, portable concentrators to have an advantage over tanks and cylinders which might be damaged and oxygen leak out, with the potential risks this entails.
Their size also helps it be much easier to carry around, move about and store. That is a great advantage, especially in public places or where at the very least some traffic occurs. A very important factor though if plugged in, you must make sure the electrical cord doesn't get anyone's way.
An additional advantage in stationary concentrators is that these may be used to refill the more portable oxygen cylinders (many times it is advisable to have a portable oxygen cylinder on hand because they are very practical for home and office movements).
All in all perhaps the greatest advantage of all is that portable oxygen concentrators are increasing potential activities for individuals who have problems with insufficient oxygen.