if you're in a thrifty mood, this Piero Guidi Duffel Bag will fit the bill. It's a great choice, while not very costly. In this price range, you can also look at this Fossil Holdall. It's also a popular item and won't break the bank. You may also want to look at this Buti Holdall. This item is not expensive either, but it will make a difference in your wardrobe.
If you're looking for a happy medium, look no further than this L.a.p.a. Carryall. This item won't break the bank, but definitely deserves a place in your wardrobe.