The way he is holding the backpack at his waist in the first one could explain the damage to it. That would be consistent with the lower body injuries. Plus he doesn't seem to be struggling holding it. If the bag was full of ball bearings and whatever else, I don't think he'd be carrying it around by his forearm so casually.
Something now throwing me off in the second pic is the color of the backpack. Is it just the blue area or the brown area beyond that? Teens use those small packs nowadays, and the blue area is consistent with that. But if the brown area is also a part of it, then that's a full size backpack that is full.
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