Isn't there?

There isn't.

think of easier ways to carry your stuff off the bike, the panniers are still the best way to distribute a load on a bike.

Use a large, WP duffel on top of your rack, partially filled when riding. Alternately, bring a large, frameless backpack (golite style), a lightweight travellng duffel designed for schlepping loads in, or a large sail bag folded up in your panniers.

Use one of these bags when your travelling with your bike as your one piece of luggage.