Lifesaver on a long flight

I had read other reviews about this cushion helping with sitting on flights - it allows you to change the amount of cushion and vary your sitting. I also used it for lumbar support and found it really helped during the long flight. Had other passengers asking inquiring about it. For me it was a lifesaver. Packs up small and quickly - I used some velcro bands to make it smaller for storage in my pack. It inflates to a certain degree when you unroll it and you can manually inflate to your comfort level.