I don't keep a lot of the 2" variety but 6" or over I do keep. To me, an easier way of joining pieces is to press fusible tricot (knitted nylon dressmakers' interfacing that I pick up on sale at Joann's). I cut the fusible tricot into two inch wide strips and press approximately one inch onto each side of the batting I am fusing. It is so lightweight, there is no bulge and it's quicker than zigzagging the edges. I use this method anytime I have to supplement the width or length of batting. I almost always buy the largest piece of batting I can when it's on sale and have relatively large 'scraps' leftover.