Deuter makes some nice backpacks for cycling...Deuter Race Exp Air is a small backpack designed to minimize sweating. This backpack is designed in such a way that there is an open space for air circulation between your back and the pack itself. The pack doesn't even touch your back. The shoulder straps on this backpack are also made to provide ventilation. It also has a rain cover. I have no idea how much it costs in the US, here in Canada it's about $120. This pack gets great reviews everywhere. It's perfect size for few small essentials.