Maxpedition make some great durable bags, their latest addition is the Xantha Internal Frame Pack, an ultra durable backpack built to resist the elements. The backpack is a comfortable pack for day use and rugged 3 day trips, it features an internal sheet frame with aluminum stay for additional support when carrying heavier loads, a pouch for a 100oz hydration bladder, drinking tube ports, several mesh pockets, and handy pouches for keeping small items close at hand...
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