you can fit EVERYTHING in it! on the plane ride home i fit all of my usual stuff plus a balenciaga first in its dustbag in it (i didnt want to put my balenciaga in my checked bag). its quite big, but not overwhelming. it easily fits on my shoulder with a lightish jacket. i havent tried it with a heavy coat though. it is also nice on the arm. i am really excited about this bag, its so great for everyday