If you can’t spend much, we recommend checking out this FjallRaven Backpack. It's a wonderful product for a reasonable price. Another strong contender for your wardrobe is this Topshop Backpack. While the price of this piece is not very high, it will surely attract a lot of attention. You might also want to consider this Herschel Backpack. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.
For something in the middle of the price range, look no further than this Moschino Backpack. This item doesn't cost a fortune, but definitely deserves a place in your wardrobe. You might also be interested in this MCM Backpack. It's an attractive option both price and quality-wise. Look at this Kara Rucksack too! Great value for your money.