great tips, thank you all.
I will try the plastic bag over the sock liners, wouldn't that result in wet feet though? Or does the moisture escape?

doing a 135k one way ride tomorrow with camping outside to see how things go.

Also for your tips on the camera and batteries: You put them on everytime you shoot? Mine has 4AA batteries and that seems like a big hassle. Is having the whole camera in my inner pocket a good idea? (its not that big)