I'm a bit of an obsessive packer.

My approach is also to separate gear in large ziplocs, however not by day but by category. I have a ziploc for bike shorts, another for jerseys, another for accessories, one for off-bike tops, one for off-bike bottoms, one for socks. I find that the weather conditions the morning of often force me to change my plans for changing.

And the ziplocs keep everything dry in the event of rain. They make really really big ones now that you can use for the sleeping bag...