Camelbak is the true pioneer of hydration packs. Years of product development are evident and tangiblecarrying comfort is excellent, the materials are carefully selected, and the hydration system works flawlessly. This 16-liter model has plenty of space for gear, even though the full water reservoir takes up 2 liters of that capacity. While many Camelbak models are heavily bike-oriented, the Octane Fusion is versatile and suitable for many activities and day hikesit even includes a trekking pole holder. With the shoulder straps (impressively named the Command Center Harness), you can keep your phone, keys, gels, and other small essentials easily within reach. The new, lighter Fusion hydration bladder is equipped with a waterproof TRU Zip zipper. Its drinking head has a rotating locking mechanism. The hose can be easily detached for cleaning or changing to a new one. - Two sternum straps - Access to the main compartment from the top and through a long zipper - "Overflow" po