Description The supremely ventilated, featured and durable Sirrus® Series receives a makeover that is more than skin deep for Spring 2017. Now featuring adjustable torso lengths, improved women's specific fit and comfort with updated aesthetics, the Sirrus® 50 is the go-to choice for everything from big day hikes to overnight jaunts in the backcountry. When the weather turns, fear not - Sirrus® keeps your gear and pack protected with an integrated raincover. Smartly organized pocketing keeps all your equipment where you need it, when you need. Features Dual side compression straps Stow-on-the-Go trekking pole attachment Dual side stretch mesh pockets Ice tool loop with bungee tie-off Integrated raincover Zippered hipbelt pockets Internal hydration reservoir sleeve Removable top-lid with zippered slash pocket Front panel pleated fabric shove-it pocket Dual vertical zippered slash pocket on front panel shove-it Osprey Women's Sirrus 50 Backpack