Originally Posted by
tarwheel
Don't rule out large seatbags like the various Carradice models. They hold a lot of gear but don't require a rear rack and affect handling less than backpacks, panniers and racktop bags. They work best with the Carradice Bagman supports.
This is working very well for me now, after years of using a rack and panniers. I hate back packs, but some people swear by them.
And as Chipcom suggested, keep everything at work that you can to minimize what you have to carry.