I have a daily round trip commute of around 20 miles and now that it is getting warmer out I'm beginning to dislike my backpack. I have a large Kryptonite NY lock that I need to carry with me. The problem is that in the summer it is often the only reason I carry my bag. Any suggestions on how to lug this thing around with me without a bag? Definitely do not want to attach any crap to the bicycle, and the lock is way too big for a pocket. Maybe I just need a smaller lock.