[cresmoon]

Forgive me if this is a dense question but I am a very novice knitter. Wanted to make a bag out of a pattern I found at Joann's website using Lion Brand Wool Ease Thick and Quick yarn. The pattern suggests using a button but I'd really rather use a zipper that closes the entire bag so nothing falls out. Has anyone done this and can tell me how and what kind of zipper to buy? Any help would be greatly appreciated.