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The pocket it folds into is genuinely tiny, so I've started keeping it strapped to my pack's hip belt for sudden downpours. Slipped it on mid-hike in about thirty seconds and the pack stayed bone-dry through the rest of the storm.

Took it on a weekend trek where the sky opened up halfway through, and the pack stayed bone-dry while the cover itself folded back into my pocket in seconds. It's so light I forgot it was even in there until I needed it.

Pulled it out of my pocket during a sudden downpour and had it on the pack in under a minute. The stretchy cord cinched everything tight, and the whole thing dried off in the hotel room by morning.