They are kits for your tooth brush, toothpaste, and anything else you can thing of. This means my bag won't get all wet from the tooth brush!
I used the crease marks as a line on which to sew on, pinned and went at it. (I sew by hand but you can use a machine too of course) in one of the quarter creases I did another line down in half for a better fitted tooth brush pocket. Of course you can size and place pockets how ever you would like.