The 12 liter Adv Skin 12 Set has ample cargo space not only for your drinks but also energy gel, snacks and foul weather clothing. - Front panel bottle pockets include small item pockets - Two 500 ml Soft Flasks included - Large main compartment at rear - Compression straps - Compatible with 1.5 liter hydration reservoir - Telescopic and fold-away pole holders - Compatible with the Salomon Custom pole bag (sold separately) - Choose your size based on chest circumference: - XXS: 80-85 cm - XS: 85-91 cm - S: 91-97 cm - M: 97-103 cm - L: 103-109 cm - XL: 109-118 cm Men's sizing. Choose the size as you would choose a women's tee shirt.