Cut out a piece of muslin, and use a cute print if you like :)
Use your imagination, for there is no photograph, my friends! Fold over a little less than half an inch on one of the long sides and sew.
Use a long, thin tool to poke the string through (I used a leather needle)
With the sewed side out, fold it in half and whipstitch the side and bottom. Turn inside out :3
OPTIONAL::: make a tag using the paper and packaging tape. fold the paper twice and decorate to your little heart's content. Cover with packaging tape and poke a hole in it. Tie to your bag :D