WERE £39
This fold -up seat has a multitude of uses:
Bus, subway, train station, airport waiting, waiting for dinner, dating, people, open air activities, picnic camping, outdoor sports, travel, etc.
It is very portable, folding up to slightly larger than a bottle of mineral water
Fully opened it stands as high as 72cm but can be adjusted down to any size.
The seat can withstand up to 100 kg of weight. 
The  ergonomic structural design uses tough polycarbonate material.