Product Details Backpack containing internal sheet frame with aluminum stay for additional support when carrying heavier loads. Built around a polypropylene frame with a single aluminum stay, these packs are lightweight alternatives to the steel framed rucks of the past. On top, you will find a soft-lined sunglasses pouch and a sturdy button lock that secures zipper pulls. Inside you will find a pouch for 100oz hydration bladder, ports for drinking tubes on both side, and a variety of mesh pockets to organize your gear. On the back, soft and breezy egg crate padding wicks moisture. A padded removable waist belt distributes the load, and handy pouches keep small items close at hand. The bottom of the pack is reinforced with Hypalon, and has two nylon loops for bedrolls or compression. This is a comfortable pack for day use, rugged 3 day trips, and anything in between. Volume Volume approx.: 1700 cubic inches / 28L.