I don't believe the Trek 1.2 has eyelets for a rack.

You could do a seatpost rack, but with a carbon fiber seatpost, it could be problematic. I had a friend who put one on hers and did a light loaded tour with no problems. However, CF is a little unpredictable and when it fails, it fails catastrophically with little warning.

If you don't have a ton of stuff to pack in, you could try the velo-orange Ostrich or carradice saddle bags.