If you're looking for something in between pricewise, opt for this Prada Backpack. While the price is very reasonable, this product is an easy wardrobe update. It's also worth considering this Prada Rucksack. This product is ultra popular and, just as importantly, not too pricey.
If you want to splurge on a luxury piece, look at this Prada Backpack - a great luxury choice. While you're at it, also have a look at this Prada Backpack. Yes, this item is expensive, but it does not mean it's not worth it.