Salomon has come a long way since its first adventure sports backpacks. There are also common elements between this S/Lab series Adventure 20 Set and the old backpacks: drinking bottles have always had front pockets in Salomon running backpacks, and the materials are top-notch. The vest-like fit keeps the Adventure Set firmly in place. This backpack is a good choice for long runs, ultra-running events, and fast hiking. - Compatible with a separately purchased hydration bladder - Front pockets for two soft bottles, price includes bottles - Zippered front pockets - Two mesh pockets on the sides - The zipper on the main compartment is sprayproof: the backpack can withstand light rain - Choose the size according to your chest circumference: - S = 91 - 97 cm - M = 97 - 103 cm - L = 103 - 109 cm - XL = 109 - 118 cm