Never mind paper cuts or squeezing your paper cup of coffee too hard and covering your hand in red-hot Americano, pain in the Levator Scapulae is one of the 5 most common workplace injuries.

Set up your desk and chair correctly, carry your stuff in rucksack (use both straps) and you're sorted. If you're not sure how to do this - your friendly office FM will be able to help (the desk thing, not the rucksack thing, I'm assuming you get that part without needing an assistant).