If you're budget-restricted, your best bet is this Urban Outfitters Tote Bag. It's a popular product, while not very costly. You might also want to check out this Baggu Tote Bag. It's an item you'll fall in love with which also doesn't cost the earth. You might also want to consider this BDG Tote Bag. The price is very reasonable, but the effect on your wardrobe will be pretty fantastic.