If you worry about breaking shit, put your camera gear in a pelican hard case and cut out the foam to fit all of your stuff exactly and it can take a beating. Just stuff that in your favorite pack. Depending on the camera I wouldn't worry about snow. Most camera gear (especially newer DSLR's) can really take a beating. Check this out if you aren't fully convinced. This video made me cringe but damn does it prove a point.
http://www.youtube.com/watch?v=D1tTBncIsm8