I have this chair. Bought from these guys actually.
http://www.swamp.net.au/guitar-stool.html
Solid as a rock with a back rest and foot rest. Also the seat is very thick padded. Thanks to its sturdiness it is a bit on the heavy side at 10 kilo's fully assemble. But, it dismantles and folds fairly flat. You can also save weight by leaving the back rest at home.