Originally Posted by
Evie
Note the small size of the project. She's talking about a 4" opening, which doesn't need to be hand sewn closed because it would be quilted shut. I don't think that size is meant for a large quilt. 
I don't see why it couldn't be used for a larger quilt. Just make the opening larger. You aren't hand sewing it shut, just pressing the 1/2" seam allowance to one side and allowing your quilting to keep it closed.