I have been supplied with a oxygen cylinder by Air Liquide. My respiratory nurse said that you cant get anything smaller. On making further enquiries I find Air Liquide do supply these small concentrators for my ambulatory oxygen needs. I find the cylinders they have provided me with, are heavy, awkward to manage and I feel very embarrassed when seen out with this huge (to me I am 5ft tall). I know I would get out every day with a smaller oxygen unit. I am aged 65 on pension credit and cannot afford to rent or buy one. My respiratory nurse has not been helpful on this matter.