If you're looking for a thrifty option, this Backpack will fit the bill. It's a great choice, while not very costly. In this price range, you can also check out this Rebecca Minkoff Rucksack. It's also a popular item and won't break the bank. You might also want to consider this Kate Spade Rucksack. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.