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I use those rounded square silvered pop-up types: Prest-O-Shades
Also called springshades or collapsible fabric sun shades, they offer optimum fit and an easy folding pivot system with a satin silver reflective surface for full windshield coverage. Spring wire design collapses to approximately 10% of original size, all held together with built-in elastic. Two of them are cheap as dirt at Wal-Mart/K-Mart, etc.
When you're done, just fold'em flat and stuff'em in the pocket behind your driver's seat. Outta site, outta mind.