You usually prefer to hike light with just a handheld water bottle, but when your trek takes up most of the day, stay prepared with the Osprey Women's Mira 34 Hydration Pack. It includes a 2. 5 liter reservoir to satiate your thirst when you're hiking for hours, and its Anti-Gravity suspension system supports and stabilizes your load so you barely even notice you're wearing a pack. The Anti-Gravity suspension system uses a combination of different design elements--a LightWire frame, mesh back panel, BioStretch shoulder harness, and AG hip belt--to distribute weight, enhance breathability, and achieve a comfortable fit, no matter how far you roam. The included reservoir also has a hose with a magnetic sternum strap bite valve so you can take quick sips on the go. The main compartment offers room for an extra layer, lunch, and other trail accessories, and dual upper and lower compression straps help you keep your load compact. A helmet attachment loop lets you hook up your brain bucket when you go on climbing or biking missions, and the integrated rain cover can be easily deployed when the clouds decide to unload on you.