Pos: simple, disassemble, new tech in a old shape
Cos: long umbrella is all right but telescope one looks messy when it is opening.
I used three kinds of umbrella putting on a dish to test how many water they provide. after 4 hours, there was about 10ml water in the dish, and some parts of umbrellas were dry. That is a good result to show umbrella doesn't have to open to get dry.
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