If you're looking for an affordable item, take a look at this FjallRaven Backpack. It's a popular piece for a reasonable price. Another savvy option is this Parfois Backpack. While the price is not very high, be sure that this piece will become a great addition to your wardrobe. You may also want to look at this Vans Rucksack. This item is not expensive either, but it will make a difference in your wardrobe.