CS of 17.13" and the rack that you have is 13.4" long.... both longer than what I've got (16.3" and 12"). You ought to be able to make that work if you opt for panniers.
Another option would be just use a backpack and strap that down to the rack. Bonus for this is that a trash makes for a rain cover and a backpack is easier to carry off the bike. I would suggest a Donkey Boxx, but one (or two) of those things on a Coda just wouldn't look right...