If you're budget-restricted, your best bet is this Marc Jacobs Tote Bag. It's a wonderful product, while not very pricey. Another strong contender for your wardrobe is this Marc Jacobs Rucksack. While the price of this product is not too high, it will definitely attract a lot of attention.
If you're after a bargain, look no further than this Marc Jacobs Backpack. This item doesn't cost a fortune, but absolutely deserves a spot in your wardrobe. It's also worth considering this Marc Jacobs Bag. This product is ultra popular and, just as importantly, not very expensive.