Riding, the hydration system backpack is the whole buckle in the back, riding if the back is not ventilated, sticky sweat cover on the back that would be quite uncomfortable. handlebar bag for bike adds a grid of resin panels to isolate the back with the body. Good riding bag in the shoulder strap and waist pad inside the use of a 3D breathable mesh design, to the air a flow of space, effectively maintain the physical contact parts of the dry.