If you can afford to spend a little more, we recommend taking a look at this MCM Backpack. While the price is very reasonable, this item is an easy wardrobe update. Another great option is this Gucci Backpack. It's an attractive option both price and quality-wise. Alternatively, opting for this Prada Rucksack is a great choice as well!
If you have enough to afford it, we recommend considering this Burberry Backpack - a great luxury choice. While you're at it, also have a look at this Gucci Rucksack. Yes, this item is expensive, but it does not mean it's not worth it.