For Year 11 next year I am buying individual binders for each of my subjects that I keep at home. Then I bring one binder to school that has loose leaflet paper, which you can get from Officeworks, Woolies etc. and then use dividers to seperate that one binder into each subject. At the end of the day, you cn put these pages into your individual subject binders at home which will store all your notes etc.
I used this for year 10 and it was amazing, my friend recommended it to me because I was having back pains so it made my bag alot lighter as we do not have lockers and also the system is much more organised.
Obviously highlighters, pens, pencils etc. Check on your schools website a couple weeks leading up before you go back, my school releases a stationary list for each subject so I am not sure if other schools would do that.
Hope this helps and don't worry you have plenty of time before we go back so enjoy the holidays!