Features:

• 31 Liters
• The FlexVent™ suspension system features a flexible yoke from custom injection-molded shoulder straps, padded back panel and a lumbar panel for maximum breathability.
• Two water bottle pockets 
• Dedicated, lie-flat, fleece-lined 15" laptop compartment 
• Huge main compartment for books and binders
• 360 degree reflective bike-light loop
• External, fleece-lined pocket for sunglasses or electronics
• Front compartment has internal organization with a fleece-lined media pocket, secure zippered pocket and elastic webbing for cord management
• Removable waist belt
• Dimensions: 20" X 13.25" X 10.5" (50.8 Cm X 33.7 Cm X 26.7 Cm)
• Avg Weight: 3 Lbs 2.8 Oz (1440 G)