Platypus siouxon 100 womens hydration pack description made for ripping all mountain trails all day long our newly redesigned siouxon sue sonn 100 hydration pack offers a stable tailored fit plenty of space to organize your riding essentials and boasts the new airy floatair tm back panel to keep you cool all day long features womens fit designed and built for optimal fit and comfort pack features soft touch materials at body contact points an optimally sized back pane