If you are on a budget, this Mi-pac Carryall will fit the bill. It's a great choice, while not very expensive. Another savvy option is this Fiorelli Duffel Bag. While the price is not very high, be sure that this piece will become a worthy addition to your wardrobe. You might also want to consider this Asos Holdall. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.