Sayles is the heart of student life on campus. It contains the post office, career center, bookstore, and the snack bar, a good place to grab a sandwich. Many Carleton social events take place in the Great Space just outside of the snack bar.

The Post Office is located in Sayles-Hill Campus Center. Every Carleton student receives a mailbox adjacent to the Post Office, although the number of that mailbox changes each term. On Fridays, the mailboxes are often filled with flowers instead of mail, thanks to the Friday Flowers tradition.