Muddy Waters is  69" x 87".  Kit includes fabric for the top and binding. Purchase the backing fabric with the kit and receive a 15% discount on the backing.
 
If you like to over-size your blocks and trim them so they are perfect, I would strongly suggest that you use a Bloc Loc ruler. For Muddy Waters,  the Bloc Loc Half-Square Triangle ruler - any size from 3 1/2" - 6 1/2" will work perfectly.