What is an S-shaped object rotating at constant speed?

[surajt88]

Somehow it doesn't seem to me to be an S-shaped balloon with it's constant rotational speed. Any idea what this could be?

 

[JaredJames]

Why could a balloon not do that?

It's rounded rather nicely for a balloon, holding fairly stable.

Looks like something blowing in the wind.

 

[FlexGunship]

Looks like something blowing in the wind.

Agreed. I got the impression of a garbage bag with a few light objects in it. True, the movement was oddly repetitive, but there's really no reason why that's not possible for a garbage bag in the wind.

 

[pallidin]

I viewed the vid, and noticed how much the object was affected by the wind.
Balloon or similar for sure. Easy!
And the "S" shape certainly accounts for it's rotation in the wind.

 

[Nik_2213]

Towards the end, the object resolved into a close pair...

My guess, a couple of party balloons tied together...