Just because Ultimate Direction designed its Highline Backpack for trail running doesn't mean this pack doesn't excel on the road too. Ultimate Direction equipped this hydration pack's back panel and waist belt with 3D AirMesh for excellent ventilation, and the nylon mesh shoulder straps ensure maximum breathability to keep you sweat free while you run. The HDPE framesheet offers lightweight support to keep the load stable for your comfort. Ultimate Direction built the rest of this pack out of nylon for strength and durability so you can run with it for a long time. The Highline features a separate reservoir sleeve with a hanger for the included 100 ounce reservoir so you can properly dry it after a long day. The locking bite valve means you won't look down to find that all your water has leaked out, the quick access storage pockets on the waist belt secure your valuables, and the accessory pockets on the shoulder straps store your energy gels or bars so you can get to them on the go. The Highline also features overflow storage pouches that can hold water bottles, cameras, phones, or other small items so you can leave room in the main compartment for an extra layer or two.