is that divider collpasible or what? i've been going back and forth about it, but i want ot have the option of packing a good amount of stuff in there. when i ride to school with the crappy bag i have now, all of my folders and flat things end up curled up in the bottom of my bag. i was thinking the divider would help eliminate this problem, but i don't want to lose space. whatta ya say?