This technical, done-in-a-day CamelBak hydration pack for multiseason hikes provides zippered backpanel access to the reservoir inside. OMEGA HydroTanium reservoir is made from an improved polyurethane film for enhanced tensile strength and burst resistance. Big Bite valve is ergonomically positioned for easy drinking. Reservoir is taste-free, easy to clean and easy to fill via a 3.5 in. wide opening. PureFlow delivery tube keeps water as fresh as store-bought bottled water no plastic taste. With its separate, large zippered opening at backpanel, the reservoir can be easily refilled or replaced from outside. Main compartment holds lunch, gear and all your ten essentials for a one-day peak ascent. Large front weather-resistant zippered pocket keeps electronics, cell phone or other valuables close at hand. Behind front pocket is a stash pocket to keep hat and jacket handy dual side-compression straps help secure contents and cinch entire pack down tight. Small zippered top pocket with soft lining stores sunglasses or MP3 player exit port accommodates headphones cord. Ergonomically designed Dynamic Suspension harness spreads the weight across your back to maximize load stability and hiking comfort. Air Director backpanel with three-dimensional air mesh harness keeps cool air flowing across the back. Features padded shoulder straps with sternum strap and a cut-away waistbelt providing maximum ventilation and even load distribution. A side zip pocket and a side mesh pocket let you keep small, often-used gear and snacks close at hand. Front daisy chain and twin trekking pole loops let you stash and lash extra gear to outside of pack. Made from rugged nylon and abrasion-resistant ripstop nylon for long-lasting wear.