I commute to school with a backpack on my 2009 Kona Paddywagon. My bike is substantially less fun to ride with weight pushing me down while I ride in the drops and straps constricting my breathing. I'm sick of the large patches of sweat wherever the bag touches me, and I dread the bulk of my bag on top of my heavy winter coats. I want to put it on a rack.
I've heard the old Paddywagons had rack braze-ons, but they stopped using them. Should I worry about overloading my rear triangle or damaging the tubing with p-clamps? I'm also concerned about loading the weight of all my school books on one side with a pannier or backpack-pannier. I originally thought to just get a waterproof backpack or messenger and bungee it to the top (or use my current bag wrapped in plastic). Is this the best plan? Are there large trunk bags (or something that sits on the top of the rack, rather than the side) that are meant to be detached and carried the same way as the Ortlieb and Arkel combo pannier-backpack/messengers?
I'm not interested in buying a new bike yet.
Thanks for reading. Thanks to anyone who replies, especially if you're good looking or helpful.