My #1 tip for keeping your student organized: reset the backpack weekly.
Every week, yes every week, make sure your student cleans out her backpack. Have your student take out all the projects and papers, and make sure there aren’t any completed assignments or forgotten HW crumpled in the bottom of the backpack.
Also clean out any gym clothes, food containers, or other items that have accumulated from the week.
Cleaning out or “resetting” the backpack is a simple - but critical - routine to keep your student organized for school.