If you're on a thrifty budget, your best bet is this Backpack. It's a great item, while not very costly. Another strong contender for your wardrobe is this Matt & Nat Rucksack. While the price of this product is not very high, it will definitely attract a lot of attention. You may also want to look at this Vera Bradley Backpack. This item is not expensive either, but it will make a difference in your wardrobe.
If you're a bargain shopper, consider purchasing this Backpack. While the price is very reasonable, this piece is an easy wardrobe update. It's also worth checking out this Cleobella Rucksack. This item is ultra popular and, just as importantly, not very expensive. And do check out this Backpack! It's a very popular item and good value for money.