The Osprey TEMPEST 40 W II S/M with 40 litres of volume is a great backpack for a wide range of outdoor activities. This model is designed specifically for women and features the AirScape™ back system with durable mesh for improved breathability. If you’re going trekking, you’ll love the Stow-on-the-Go System™, which allows you to easily attach your poles without having to stop. All you need to do is put one end of your pole through the loop on the backpack and the other through the loop on the shoulder strap. On the left shoulder strap, you will find a stretch pocket for your phone. The Tempest 40 W II S/M is water bladder compatible.