Simple and easy, nothing to excited about. For the price I paid for these, OMG! stay awau I can?t hear much with them on. Perfect for what I needed. To potential buyers, I would order a full size smaller than your usual size--definitely if youre between sizes. I can take nutritional yeast and even red pepper flakes along. I can?t believe so many reviewers fail to realize that there IS a lip on both ends, you just need to remove one end and flip it around. Options of one size only packaging would be nice. He absolutely loves this bookbag!