Extra-long twin beds are standard at all coed schools, so make sure you find the right size sheets. Consider your need for throw pillows; they can take up a lot of space in a small dorm room.
Most colleges provide a single light in the ceiling, so even with a desk lamp your room can still be dark. A tall, multi-bulb lamp can brighten your room and make reading easier. Many schools consider halogen bulbs to be fire hazards, however, so research your school's policies before buying anything.
If you're lucky, there will be a dresser or a built-in chest of drawers. Plastic drawers that stack on top of each other or a wide plastic bin that fits under your bed can help immensely with storage in a small space. Super-flat vacuum bags are also an excellent way to reduce clutter.
Outlets are scarce in many dorm rooms, meaning that you'll have to plug several items into a single power strip with six different outlets. An extension cord is also a good idea. Many colleges require a surge protector, which may save you the pain of a computer crash the night before finals.
Unless you have a bathroom inside your dorm room or suite, you'll need a tote to transport your shower items to the floor bathroom. Opt for the larger bath tote because you'll add items after arriving.
Obviously you'll need a toothbrush and soap, but you'll also need the less obvious items like Band-Aids, aspirin, tissues and cough drops.
Consider the time between arriving at school and returning home. If you won't return home until Thanksgiving, you're going to need clothes for the end of summer as well as the early winter, so pack accordingly.
Select a large waste basket to avoid making frequent trips to the common waste room.
Bring plates and utensils for breakfast and late night snacks when you may not want to walk to the dining center or store.