Ferrino Zephyr 17 + 3 is an extensible 17-liter backpack with attention to detail and equipment, ideal for running, mountain biking or hiking. If you are looking for a technical and versatile product to move lightly in your outdoor adventures, Zephyr is the one for you! Made in Diamond HD it has a low weight, but a high resistance and for this you can take it with you over and over again without problems. The backrest allows you not to sweat too much during long journeys thanks to the "Dry Net System" system, whose transpiration is guaranteed by the mesh fabric, while the load distribution and stability during transport are optimized thanks to the flexible steel insert. Even at full load you will be stable and safe in your movements, without going out of balance and risking losing your balance! If the back is super-breathable, the same applies to the shoulder straps and the waist, thanks to the "Hollow Back System", which involves the combination of pre-formed padding, with ventilation channels and mesh fabric. Loading will not be a problem either! The 17 liters available can be expanded up to 20 l, also thanks to the numerous pockets located in various areas of the backpack you will have the ability to organize the load cleverly, always having everything you need at hand. The technical equipment is varied, starting with the back cover that protects you from the rain, up to compatibility with the H2 hydration system, which is very convenient when making long journeys. You can also keep your poles and helmet always at hand, so you can take them when you need them! Ferrino Zephyr 17 + 3 trekking backpack