What you pack your stuff in is just as important as the stuff, itself. Opt for a roomy duffle with convertible straps and pockets a-plenty.
Cotton tee + comfortable sneakers + no-brainer shorts = your everyday uniform (and be sure to add a sweatshirt and raincoat just in case).
To maximize space, roll up your tees, shorts, and pants (anything not prone to wrinkles) and stack them side-by-side in your bag.
How To Pack
Put shoes (stuffed with socks, to save space) on the bottom of your bag, with heavier items like jeans in the middle, and lighter stuff on top. Keep emergency layers, like a raincoat, within easy reach (an outer pocket will do).