I have a Sony A700 so I went to Wolf Camera and bought a camera sleeve that I can place my camera into with a hole in one end with a draw string to tighten it around your lens. Then you hold your camera with the sleeve over your camera and arm. Snap! Snap! Snap!

Just my thoughts and ideas. Great idea to bring ziploc bags to protect your electronics as you never know when someone might want to ride a WET ride!