I find this tool to be quite handy. I have a cargo basket and roof rack on my trucks and I use the crap out of these little guys. Makes securing a load much easier. In most cases I find this better than regular straps. Highly recommended and maybe they will help someone else out in life avoid knots!
They sell for about $2.99-4.99 with rope included. I buy mine at harbor freight and I have about 5 or 6 and that seems to be enough for me.
Here's mine in action. After a rocky dirt road the fire wood and cargo box still snug after 134 miles!