This is an idea way of joining 2 sets of live stitches together is using a 3-needle bind-off. This creates a perfect seam with very little work!
Insert a third needle into front of first stitch on each of the 2 needles, knit through both stitches together, *insert needle into front of next stitch on each of the 2 needles, knit through both stitches together, bind-off one stitch; rep from * until all stitches are bound off.