Umbrellas, even the compact ones, are simply too large to walk around with all day waiting for a sudden downpour. The solution is simply to go even smaller, like this cool new ShedRain Super Slim Auto Open / Close, the world's smallest automatic umbrella. This ultra-compact and lightweight umbrella can inconspicuously be slipped into a coat pocket or purse because it's only 8" long when closed and weighs only 9oz. When the rain drops begin to fall, just push the button to automatically deploy the generous 40" diameter nylon canopy with a tough, breeze-resistant steel shaft, ribs, and stretchers. It's definitely a better sized umbrella, but I'd still rather go inside when it rains.
World's Smallest Automatic Umbrella