He absolutely does need a backpack for college, but chances are very good that his old high school backpack will be suitable.
He's not likely to tote his laptop around campus. My college daughter reports that after the first few weeks of class, no one does that. She says that she uses her laptop intensely in her room, and she carries it out to the commons area in her dorm, but other than that, it's very rare that the laptop goes . . . anywhere.
We did buy her a nice laptop bag -- it's a messenger style, and I forget the name brand but it starts with a T. She does use it when she brings her laptop home for weekends, but that's all the use it's getting.
Stories I've heard about kids ruining their laptops include 1) a bowl of cereal being spilled on a laptop . . . 2) a laptop falling off a top bunk when the kid positioned it too close to the edge and jumped down. I've not heard of anyone damaging a laptop by carrying it.