Check your local hardware store, or Lowes/Home Depot.
He is talking about rope, not strap.
So am I.
I have some I bought at a local plumbing supply, have seen them at various stores too.
Pull the rope to tighten, squeeze a tab to loosen------right?
Just as data point. I have used the hardware store variety for several years.
They look just like and may be these.
http://www.etrailer.com/Trailer-Cargo-Control/Erickson/01801.html
They held the RV-10 down in the SnF tornado (probably more luck than strength) and have held the Kitfox and Maule in place in some serious winds.
YMMV