I just got this backpack and love how cut it is, the main opening has a metal support bar that provides extra support when you want it open but doesn't make it bulky and stick out while closed, I love that it has a smaller side pocket on the inside and the full size zipper pocket on the front. The bottle holders on the side are tall enough that you can safely fit a large bottle in it wihtout worry, I do wish it has a couple smaller pockets somewhere on it for pencils and smaller items but otherwise I love it.