Kelty Trekker External Frame (55, if I recall) backpack.
Never actually used, has been stored in a closet since it was purchased.
http://imgur.com/SNy2sun

Details:

• Top loading
• Sleeping bag compartment
• Zippered side pockets
• 420-denier polyester Ball Shadow body fabric
• 420-denier polyester Oxford reinforcement fabric
• Hydration compatible
• Reservoir sleeve
• Mesh water bottle pockets
• Spindrift collar
• Ice-axe loops
• Daisy Chain
• Lash tabs
• Key fob
• Hold-open bar
• Large front pocket

Suspension Features:

• Adjustable suspension
• External frame
• Removable dual density foam waist belt
• Padded shoulder straps
• Load-lifter/stabilizer straps
• Sternum strap
• Patented Scherer Cinch

Specifications:

• Capacity: 3,950-cubic-inches
• Weight: 4 lb.s 14 oz.
• Measures 22.5 x 29 x 13 inches (W x H x D)

Link on Amazon:
http://www.amazon.com/Kelty-Trekker-External-Frame-Medium/dp/B004CXCQ0I/