Charted or uncharted, this bag can handle any terrain you enter. It's like your regular bag's buffed up second cousin, featuring mesh-lined EVA back panels and a water-resistant coating over its durable nylon construction. In addition, the bag was born with a reinforced base, internal laptop sleeve, and padded, adjustable shoulder straps. But what really makes this a weather-ready carrier is its drawcord closure and clip-fastened storm flap and ripstop rain cover. The latter stuffs into a zippered storage sleeve when not in use. The bottom line is you can take this bag on your next trek down the Appalachian trail, or on the rough and tumble of your city commute.