Pentagon Tactical assault backpack is 51 Liters and has a molle laser cut system on te front plus the ability to use the hip straps. 
It has the ability to hold your laptop as well as plates and other gear. Great for hiking or everyday carry use. 

SPECIFICATIONS: 

• 100% Polyester 600D
• Laser-cut Molle/PALS system on the front pocket
• SBS® Zippers
• 420HD webbing
• Waist straps
• Adjustable chest strap
• Compression straps
• MOLLE/PALS Lasercut system
• LxHxW 51x36x28cm
• Weight: 1.47Kg (3.25lbs)
• Volume: 51 L