I have been looking at and trying various sorts of low back supports in an attempt to relieve my sciatic. The problems I have with it both cause pain and my entire leg to go completely numb in almost any seated position. After many attempts I decided to try this basic 'bag of air' which seemed almost to simple to work that well. I was wrong.I started by simply using this when I was sitting on my couch to watch TV or work on my computer and discovered my leg was no longer going numb. I then decided there might be other places it would be great, such as the car, also worked well. Because it deflates into a very small profile it's perfect for bringing on an airplane for both a back support or use as a pillow. I've even used it as a foot rest. I've placed it between my knees when I lay on my side to keep my spine straight.The bottom line is this thing works great and has many uses. My wife even decided to sit with it since it was already on the couch and as of today I'm ordering THREE more. Without question the most cost efficient, effective and comfortable back support I've found. Try it, you won't be disappointed and like me, you will probably find many other great uses for it.