If you're looking for a bargain, look no further than this Marc Jacobs Rucksack. This item doesn't cost the earth, but definitely deserves a place in your wardrobe. You can also look at this Marc Jacobs Clutch. It's an attractive option both price and quality-wise.
If you're looking at it like an investment piece, then you absolutely must check out this Marc Jacobs Satchel Bag. This item seems expensive, but it's worth it.