Soft, breathable fabric is comfortable even when you’re carrying a heavy load / Two 500-ml soft flasks included / Side compression provides a custom fit for your torso and minimizes bouncing when you’re running / 2-liter bladder pocket has internal routing for a hose / Zippered 6-liter pack and bungee system can hold extra snacks, a water filter or an extra layer / Secure-zip phone pocket can hold a large phone / Trekking-pole carry system on rear of pack / Has five total pockets with two snack pockets, two water bottle pockets and a secure-zip phone pocket / Whistle included / Reflective back