You can hold it "brim side up" while walking to contain the water. There's no way to do that with a regular umbrella. Of course you still need to dry it out so

You can hold it "brim side up" while walking to contain the water. There's no way to do that with a regular umbrella. Of course you still need to dry it out somehow, e.g. let it drip into a bucket; that part of the video is probably misleading.