With the Camelbak Zephyr Pro, you are ready to tackle any mountain challenge! This ultra-lightweight hydration backpack is designed for intense outdoor activities such as hiking, trail running, or climbing. Its aerodynamic design, combined with breathable mesh construction, ensures optimal comfort throughout your adventure. The adjustable compression straps keep the pack securely in place on your back, while the integrated tool pocket lets you keep your gear within easy reach. With a 3-liter water reservoir capacity and an additional 10 liters of storage space, the Camelbak Zephyr Pro is a complete and versatile hydration backpack. Fully removable and stowable trekking pole quiver: allows you to easily access your trail poles while running High-tech ventilated mesh: with body mapping technology: we have incorporated our body mapping technology into this mesh back. There are specific models for men and women, based on the areas of your back that heat up the most. Thus, your back stays cooler! Secure phone pocket: keep your phone close to the vest and close to you with our easy-access phone pocket Adjustable dual sternum strap: for easily customizable fit, ensuring your comfort all day long Expandable storage pockets: perfect for the little extras you might need during your journey Food and gear storage: just enough room for all your snacks, water, and running gear Reflectivity: various highly visible intentional reflectivity points to ensure you can run safely when the sun sets Safety whistle: on the trails, you are our top priority. The safety whistle is perfect for alerting others that you are approaching or for calling for help Four-point compression: the vest features 2 compression straps on each side, allowing it to contour perfectly to your body. Thus, the vest feels like it was designed specifically for your body, and you forget about it while running Ultra-lightweight materials: this means no unnecessary baggage for your trail, allowing you to run comfortably all day Tube Trap attachment: it gives you the flexibility to use a water bladder and easily grab the hydration tube without having to undo the buckle or hook, for easy hydration while running Quick Stow flasks: these lightweight, collapsible flasks fit easily into your running vest pockets; featuring our classic one-piece silicone bite valve for quick hydration, they are perfect for a day of running Volume: 11 L Camelbak Zephyr Pro - Hydration backpack | Hardloop