The 3-Needle Bind Off is a great finishing technique for joining two pieces of knitting that are still on the needles. It is also a great time saver because you bind off and seam all at once!
Note that a 3-Needle Bind Off and the Kitchener Stitch are somewhat interchangeable. The advantage of a 3-Needle Bind Off is that it’s easier to do and that, because it creates an actual seam, it offers some structural integrity. The Kitchener Stitch is a bit trickier to work, but it creates a smooth and seamless finish. Same but different!
To end up with the seam on the wrong side of your knitting, arrange the two pieces with their the wrong sides facing out. Hold the needles parallel and slip a third (working) needle into the first stitch on each of the two needles.
Wrap yarn around working needle as if to knit, and knit the two stitches together. Allow the first stitch from each of the parallel needles to fall from the needles.
*Knit together the new first stitch on both parallel needles in the same way as above.
There will be two stitches on the working needle.
Using one of the two parallel needles, pass the first stitch on the working needle over the second stitch and off the needle, as you normally would when binding off.
Repeat from * until only one stitch remains on the working needle.
Break yarn and pull the tail through the last stitch to fasten off.