same here. i am a total backpack convert. i used to commute with a rack and trunk bag, but i just like the way a bike handles when it's as light as freaking possible and not encumbered with heavy racks and bags/panniers. i'm so stubborn about the backpack thing that even when i did an unsupported 900 mile LEJOG run all the way across great britain last summer, i did the entire tour with a backpack. the other guys on our tour thought i was nuts, but it's just the way i am.