I save batting scraps down to one inch in width. Narrow one inch pieces are used in handles for tote bags. It makes the handles more firm. All the rest are zig zaged together for smaller projects, place mats, runners, totes. Larger pieces may be zig zaged together for smaller quilts. Nothing goes to waste. I sometimes use micropore surgical tape to "piece" odd sized pieces together, especially if I am in a hurry. It just holds the batting edges together, is thin enough to be negligent in the quilting process. I don't know if dissolves in the wash but once the quilting is done the batting holds together in the finished process. I do usually quilt quite closely and I use a warm and natural batting. I don't think it would work on a polyester batting, but I don't use that anyway.