If you're looking for an affordable item, this Roxy Fanny Pack will fit the bill. It's a fail-safe choice, while not very pricey. Another strong contender for your wardrobe is this Dakine Fanny Pack. While the price of this item is not very high, it will definitely attract a lot of attention. You might also want to consider this Briggs & Riley Holdall. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
For something in the middle of the price range, look at this Ash Backpack. While the price is very reasonable, this item is an easy wardrobe update. It's also worth looking at this Tumi Backpack. This product is extremely popular and, just as importantly, not very expensive.