If you can afford to spend a little more, look no further than this Satchel Bag. This item won't break the bank, but absolutely deserves a spot in your wardrobe. You can also check out this Lanvin Crossbody. It's an attractive option both price and quality-wise. Look at this L.A.M.B. Backpack too! Great value for your money.
If you're not the one to skimp on clothes, then what you're looking for is this Mario Valentino Backpack. It's more expensive but worth your money.