Meg Aero Dart. ABS plastic monocoque shell for impact protection. New Lycra mesh laminate harness to reduce heat build-up against back. New Aero ratchet lock. Laptop compartment Certified Back Protector by TUV. ABS plastic monocoque shell for impact protection. New Lycra mesh laminate harness to reduce heat build-up against back. New Aero ratchet lock. Laptop compartment 14x10x2 in. Size: 22x12x6 in. Weight: approx 4 lbs. Vol: 1220-1525 cuin(20-25L). External strapping system, sternum strap, waist belt, cell phone pocket.