Adidas Prime iv was what I landed on last year for then 7th grade ds. It fit the huge zip up binder, the Spanish 2 inch traditional binder, gym clothes, etc. one year in, looks brand new. He will be using again. Check sales, etc. I think I got it at ebags last year.
I was so frustrated with the the depth of his prior backpacks I literally made a spreadsheet of h/l/d to compare.
I posted this earlier but Famous Footwear had Mission Plus backpacks for 35 a few weeks back, bogo 50 percent off.
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Baby Bargains