This was my first time making a drawstring bag and I have to say it wasn't that hard! I didn't take enough photos as I was going along (concentrating too hard and in a bit of a rush!) for a full tutorial but I hope to write it up as a downloadable pattern over the Christmas. It was fun and I would definitely make more of these.
For now, here is the design and the piece parts to make up the front of the bag! The cake section is 6.5" x 9" unfinished and 13" x 13" total size front and back so not too big and something easily made from scraps and fat quarters. I think this would be really cute for Christmas with a penguin or a Rudolph on it!