Poncho straps

#1
I just noticed that the inside of my lightweight poncho (NSN 8405-99-132-1639) has a couple of shoelace type straps in it. What were their intended use ?

 
#4
Actually, I strung it up between some trees with a few bungees and used it as a shelter while bird-watching. It was only then that I noticed the cords hanging down.
 

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