If you can afford to spend a little more, consider this Stella McCartney Backpack. While the price is very reasonable, this product is an easy wardrobe update. It's also worth checking out this Rucksack. This product is extremely popular and, just as importantly, not too pricey. Alternatively, opting for this 3.1 Phillip Lim Backpack is a smart choice as well!
If you want to treat yourself, then what you're looking for is this Fendi Backpack. It's more expensive but worth your money. Another product we're drooling over is this Prada Backpack. It's costly but you get what you pay for. And how about the luxurious Chloé Rucksack? Yolo, right?