The Mach 3 has the ideal streamline, does not deform by the wind & is water repellent! What is the difference between Mach 3 & 1? The back panel is equipped with special foam for added comfort & ventilation, & the shoulder straps on the neck area are so soft they will not cut into your throat when you re giv- ing! In addition, it has several compartments, a separate electronics bag made from fleece, a compartment for an extra pair of shoes & a beautiful red interior! Features Capacity: 22 L Weight: 1.2kg Padding + inner sleeve for tablets / 15 "laptops Tray for shoes helmet straps Hydration prepared