When it comes to choosing the best running backpack, the options are endless, depending on your need. If it’s an ultramarathon, you’ll want a lightweight, minimalist pack to carry gels, energy drinks, snacks and waterproofs. If you’re planning to add a run commute or two to your weekly mileage, you’ll want something more substantial in which to lug your laptop and change of clothes.-Zipper main compartmentSide compression straps-Inside sleeve for hydration pack-Front zipper pocket with rain guard-Reflective logo-Padded mesh back panel-Exterior stretch mesh pockets and small zipper pockets on hip belt.-17.52 in H x 9.25 in W x 5.12 in D, Weight - 1.08 lbs