<p>I have the largest mini fridge I’ve ever seen (between 4 and 5 cubic feet) with it’s own separate freezer and wouldn’t have it any other way. I keep juice, fruit, bagels, cream cheese, etc in it, and I can also keep ice cream and frozen pizzas. 
The large size was also convenient for leftover pizza or boxes from restaurants. </p>
<p>My one roommate and I barely managed to share mine so I can’t imagine a 3cu.ft. mini fridge having room for much of anything between four people. If you expect to have more than a drink or two cold in your room I would think you’re going to need another one, unless the other kids don’t use it. As for what size you need, it just depends on what you want to use it for. I think most people keep less food in their room than I do. I am usually to tired to go back out for dinner after class, so I like a bigger fridge.</p>