The Nadachair and Slouchbuster are based on the ropes that Tibetan monks use to sit upright for hours on end when meditating. The monks use these ropes between their knees and back to help them stay upright. The Slouchbuster is a small, much more elegant version than ropes. The Nadachair is a larger version.
I’m a yank who lives in Perth Australia (West Coast). I fly often to the US and Europe, in coach. I’ve found this little thing is what allows me to sleep and survive 19-22 hours of crowded coach seats. I use the Slouchbuster when I travel because:
(1) It is very small. It is the size of a paperback book when folded up.
(2) It folds up and then zips up inside itself. It is totally self contained. No bags or anything needed.
I also own a Nadachair, too, which I keep at work. I use that a couple times a day to keep my back straight. I write software for a living, so I’m sitting for hours on end. It really makes a difference, especially if you have any sort of lower back problems (like me). I owned them for a couple of years now and I found that I no longer need a monthly chiropractor visit. So it has paid for itself within a month.
[This is the same produce as the more-recently reviewed S'portBacker -- SL]