I use 1 of these for my bike commute to work as well as full day trips (not for overnighters). I can fit my lunch + rain gear + one or two extra small things in there. It attaches easily to the bike, and have found that when fully loaded or lightly loaded, it does not jiggle or bounce around much. Takes 30 seconds to both take off and put on bike. The materials are quality, as one would expect from Duluth Pack. There is one plastic buckle (top cover) and some nylon cords that may break over time. But so far mine have had zero issues and if they do fail, are easy to replace. I'm not worried about it. I've gotten several comments on it from friends and strangers. Simply put, it looks cool. It is not waterproof (it doesn't advertise itself that way either). I used a couple layers of otterwax and that makes it rain resistant which suits my needs. As I continue to put this sucker through heavy use, I hope in time to expand more on this review.