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This inexpensive umbrella, when deflated, would be smaller and lighter than a conventional umbrella. Made of beach ball type plastic, the upper surface would be one ply areas extending between tubular "ribs" similar to the shaft/handle.
US Patent 3,954,117 (1976)
"A pocket-sized inflatable umbrella of the type primarily intended for disposal after a single use including a thin flexible plastic sheet having air passages formed therein [...]." [jutta, Oct 05 2004, last modified Feb 24 2008]
[xaviergisz, Jan 21 2013]
||which bits are you inflating? a bit worried that its so light it would blow away in a mild breeze.
||Toss a pump (or better yet, a replaceable, regulated CO2 cartidge) into the handle.