Is the Osprey Volt 60 too big of a bag for thru hiking the AT? I'm going back and forth on whether I should go with the Volt 60, or with the Osprey Exos 58...I know the 58 is lighter, but have heard the shoulder straps and hip belt are sturdier on the Volt 60, which, to me, seems more likely to hold up better on a thru hike. Any words of wisdom, or recommendations???