While durability is your primary concern, be sure to consider "future-proofing" too. The factors I look for, in order, are: amount of RAM (8GB should be adequate); storage (more is always better); available ports (I prefer a minimum of 3 USB 2.0 ports, USB 3.0 is even better and USB-C will become more important over the laptop's lifetime); CPU (depends on what you will be doing with the computer); and GPU (again, depends on what you'll be doing).
If you expect to use your laptop very often away from your dormitory desk, also consider how usable the keyboard and pointing device are, and the battery life. I'm well beyond typical college age, and when I'm home I use a wireless "desktop" keyboard and mouse; sometimes they go with the laptop when I'm traveling, simply because I'm spoiled and make fewer errors with them than the laptop's own keyboard and trackpad.
If you will be using the laptop primarily for writing assignments, the CPU and GPU don't need a lot of power; but if you study anything involving lots of graphics, video or serious number-crunching, you will obviously need more computing and/or graphics power, and you'll certainly want more power if you are a gamer or shoot much video as a hobby.
A laptop with only 4GB of RAM might be enough for writing assignments, but bear in mind that some laptops' graphics systems use part of system RAM; the HP laptop I'm using now takes nearly 1GB of its standard-config 4GB total. You can upgrade the RAM easily enough on most consumer laptops, but it's often less expensive to buy the amount you need factory-installed.
When it comes to storage, consumer laptops usually come with either a relatively small SSD or a larger HDD. But you can always use an external USB drive to hold things you don't need on the computer constantly. I'd recommend a small portable drive that doesn't require a separate power adapter, for those times when you'll be using the laptop away from home -- you never know just when you'll need something that you didn't think was important enough to keep on the internal drive. (In fact, I recommend getting two such drives, or one portable and one desktop-style external drive, using the second one to backup everything on both the internal and the first external drive.)
If you connect an external drive, keyboard, mouse and printer when you're home, you'll want a minimum of three appropriate ports -- you can always disconnect the keyboard and plug in the printer when you need to, or buy a USB hub to get more ports. My laptop usually resides on the coffee table in my living room (with the printers in another room, connected via Wi-Fi) and I still frequently find all three of its USB ports in use. In fact, I usually have a little USB hub plugged in for connecting flashdrives.
As for your first concern, durability, a lot depends on just how durable you need the laptop to be. I'm on my third HP. The first one went six or seven years before I outgrew it. The second died after five years with a graphics-system problem. My current laptop is less than two years old. All three of my laptops have been primarily stay-at-home machines that I moved from room to room, occasionally traveling by car and rarely by air (in stowed luggage). I've never owned other brands of laptop, so I can't comment on their durability.
I consider battery life a durability factor, but one that isn't critical; most laptops have easily-replaceable batteries, and I'm seldom far from an AC outlet when I'm using a laptop. It's hard to find a Starbucks that doesn't have at least one duplex outlet near every seat inside the store, and I've even seen a couple with weatherproof outlets on the patio. (If you prefer McDonald's, finding an AC outlet might be more problematic.) A battery that's good for over four hours per charge should be adequate unless you expect to be using your laptop away from AC most of the day. I will recommend buying a second AC adapter, keeping one at your desk at home and the other in the laptop bag or backpack.