Deuter makes a great riding backpack. It has mesh shoulder straps and there is a mesh back panel that is actuall a coule of inches off the bag itself, so the mesh allows air to get to your back and the space allows air to circulate. My friend has one when we go mtn biking. I just use the camelback backpack and get a soaked back every time. I dont know the model name but I`m sure if you look up Deuter (a German backpacking company) and look up their biking backpack line you`ll find it