Originally Posted by
owenfinn
Rixen & Kaul sells a few backpacks that attach to the seatpost with a klickfix adapter. I've been using the Meta Freepack small for a couple years now - It's great! You can click on my flickr link below to see some pics.
Nice set-up, but I'm not sure that is for the OP. It was stated they use their backpack for school, which implies files/folders/textbooks, which can get fairly heavy pretty quick. What's the weight limit on that freepack of yours?
EDIT: Here's a link-
http://www.klickfix.com/index.php?mod=1〈=en
Weight limit is 11-15 lbs, depending on model.