Ok, so I didn't do a great job of perfect measuring, but you get the point.
This is what your fabric should look like when you are done. Now open up your fabric so each end looks like this. You will then want to cut through every other joint.
Now do it again at the other end. But pull the first strip down so you can see where to cut. It will be the second cut over.
The first strip on the right is from the other side. I moved over two slits and cut... then skipped a slit and cut the last one.
You should now have one continuous strip of fabric. The joints will look like this.
I cut a little closer to the edge. Don't cut too close or you might rip the fabric and then have to join it together either by sewing or tying.
So ends my first tutorial! Hope it helps someone out there in internet land!