Dude, i live out of my bag. Aside from 2 rackets, can o' balls, bandanas, sweatbands, shoes, wimbledon towel, string, asprin, deodorant, change of clothes, jacket, jump rope and resistance bands. I've carried a laptop in it multiple times, my portable HD almost all the time. Its going to be a funny day when i try to carry a guitar in it. But thats what happens when i live in London and often travel from uni to tennis back home all by tube.