Amazon: Shrek Princess Fiona Backpack with Water Bottle $6.99November 16, 2010 by Mitchell Wischmann This post may contain a link to an affiliate. See my disclosure policy for more information. Amazon is offering up the Shrek Princess Fiona Backpack with Water Bottle for only $6.99, down from $39.99! This item ships FREE with your Prime membership or on orders over $25. Hurry if you want one!