Really, the only way to help would be to simply get a bigger binder. I'm not trying to be rude, but if you're going to be thick by thinking a bigger binder makes you look stupid, then just deal with it.
once i get to highschool i can carry my backpack around class
at my school we can carry our backpacks everywhere except gym and put anything in our lockers to get between classesmost of my teachers keep the textbooks in class