I think one of the lightest 270s is the Freespirit, Spec’d at 37#. It’s also fairly compact package when closed up and has wall options on all sides and square back. It’s rather easy to open with single rear pivot and a roomy enough bag to pack away easy.
The Crosswing is actually rather heavy for its shade Sq ft. I wanna say it’s about 36-40# or so but with one of the smallest shade footprints. It’s obviously quick, but not too stout with wind because of it’s design (opens like a projector screen).