The Osprey TEMPEST 20 M/L is an iconic women’s backpack with a comfortable, ventilated, Airscape™ back system overlayed with a durable mesh fabric. If you’re going trekking, you’ll also love its Stow-on-the-Go System™, which allows you to easily attach your walking poles. On left shoulder strap, you will find a stretch pocket for your phone. The backpack is compatible with a water bladder. It has a designated space with a mount loop between the back system and the backpack. It also provides an option for attaching your poles and the lid-lock attachment for a cycling helmet.