Felted fair purse.

OK I am currently on working a felted purse that is in brown and white strips. It is going to be a really big purse size before it becomes felted. Right now I am on about row 15th row. Each stripe has 5 rows which makes it hard for me since I am still so new so I am not sure how to keep the different colors from falling off the edges so I knot the ends which I honestly do not think I am supposed to do that. Oh well its a learning process pics will be added soon