IF YOU SOMETIMES WORK AWAY from your shop, my tip for storing sandpaper for easy transport may help you. I use a standard A-Z or 1-31 day folder. This is typically for holding a year’s worth or a month’s worth of papers in a separated file. All the papers are divided by grit size.
I print labels for all my existing sandpaper showing grit, paper weight and other description. I start with 50-grit and end with 2000-grit, leaving spaces between existing papers for additional papers to be added in the future, allowing similar grits to stay in the same relative area. When leaving for a job, a Velcro band tightly wraps the folder, and ALL my sandpaper follows me to the job.