How big are the single rooms in North Hall? Also, what is the bathroom situation?

The singles in North Hall are about 100 sqft big. There are 2 bathrooms in each floor, so about 10 people would be sharing 2 bathrooms. You can find more info about North Hall here:

How is mail handled at rpi? Are there lockers in each of the dorms for our mail or do we have to go to one central building to retrieve our packages?

All Freshman would have to go to Commons to get their mails and packages. There is one small mail box for each dorm room and you will receive the keycode with your dorm keys. Packages are arranged to be picked up on the first floor of Commons, where you would present your student ID to the staffs and they will bring out you packages.