I've never had the nerve to try it but I've wondered how well a camo umbrella would work for a quick blind. You can get them in about whatever pattern you like. Just set it down and sit behind it. You might have to brace it if the wind is blowing. It might be good to sit under if it's raining, too.

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“In a time of deceit telling the truth is a revolutionary act.”
― George Orwell

It's not over when you lose. It's over when you quit.