Nice! Interesting application of hydraulics - makes me thing of DIY 3D printed rubber/fiber versions.
http://newatlas.com/hydraulic-muscle-robots/47597/?utm_source=Gizmag+Subscribers&utm_campaign=249ac1c834-UA-2235360-4&utm_medium=email&utm_term=0_65b67362bd-249ac1c834-90265442 MJ