Designed as a 2-day backpack in an extremely functional, minimalist, lightweight and tactical style. HiSpeed II is simple, robust, very organized, light and comfortable to wear on the back with an ergonomic carrying system. X4 has a special shape which is specially made to sit close to the body. This makes it perfect for situations where you need to be light on your feet and move forward quickly. Hence, the backpack also lives up to its name. Inside there is a room for a drinking system.