There is yet another option to tanks and cylinders which is a portable oxygen concentrator arrived on the scene around 10 years ago.
Oxygen concentrators change from tanks and cylinders, for the reason that they do not store oxygen, either as compressed gas or in liquid form, but instead extract it from the surrounding air.
This has caused a series of advantages and benefits, both in the portable devices and stationary ones.
Great things about portable oxygen concentrators:
Perhaps the most important one relates to how long the oxygen lasts. As they're not containers they don't really store oxygen, and therefore it doesn't go out. They run on energy, either directly plugged in or with a rechargeable battery. How long it lasts depends on access to its power source.
Another great benefit is that they need not be refilled. Normally Inogen small oxygen tank might mean having to send off the tanks for a refill.
There are many of different makes and models suitable for just about any kind of activity. The new range of portable oxygen concentrators are definitely focused on user needs. Therefore 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 application 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 now much easier.

Oxygen is not flammable nature nonetheless it does feed flames, so aside from standard precautions, portable concentrators to have an advantage over tanks and cylinders which can be damaged and oxygen leak out, with the potential risks this entails.
Their size also makes it much easier to carry around, move about and store. This is a great advantage, especially in public areas or where at least some traffic takes place. A very important factor though if plugged in, you need to make sure the electrical cord doesn't get anyone's way.
Yet another advantage in stationary concentrators is that these can be used to refill the more portable oxygen cylinders (often you should have a portable oxygen cylinder on hand as they are very practical for home and office movements).
All in all possibly the greatest advantage of all is that portable oxygen concentrators are increasing potential activities for many who have problems with insufficient oxygen.