Happy Mask Salesman from Legend of Zelda Majoras Mask and Ocarina of Time.

This design can be used as a coin bank as the backpack is hollow and the sleeping bag acts as a lid. There includes a version with hooks on the bag to hang keys, usb sticks and masks (simple mask design included)

Choose the design with or without hooks and print with supports (note, do not use infill support as I've found that this will fill the bag with infill that will be difficult to remove). Print sleeping bag seperate lid and base optionally.