Portable device with bag allowing the patient to move as freely as possible The portable device with bag includes a smaller cylinder with capacity of 2 l. This is a very light cylinder (weighing only 2.4 kg). It helps the patient to move as freely as possible. It is also possible to use this device in a car or other means of transport. The oxygen flow can be regulated between 0 and 25 l/min by a stepwise adjustable pressure regulator. This type of regulator can be placed in any position, since its position does not have any influence on the flow rate. The patient can breathe in oxygen through a nasal cannula, which is also part of the complete unit. The bag has two separate compartments, so other items can be stored in the bag in addition to the oxygen-therapy device.