This is a great idea. Limiting the weight of textbooks/backpacks. The article says that high schooler's backpacks are weighing in at up to 40 pounds. I completely believe it. Lugging that thing around was a huge chore. I remember calling home many times for a ride because I had homework in so many different subjects that my backpack was unmanageable.
I graduated high school 5 years ago & those backpacks are only getting worse.