Do you think the Ortlieb front panniers, loaded on a rear rack would be sufficient? I'm thinking I'll have a change of riding clothes, a single set of "off-the-bike" clothing, plus a pair
My wife used a pair of Ortlieb Front Packer Plus's on a 74 day trip aross the US. Her sleeping bag, and pad are on top the rack. I carried the tent , and some of the other camping gear, but she was still pretty self contained. However, she did get a set of full sized Back Packer Plus's when she saw some on sale. We are planning a 4 month tour next summer, and she wanted to take a netbook and more than one change of street clothes.
A long answer to a short question--Yes, they should be more than sufficient for what you have described.