[Daniel_sk]

There is an unconfirmed blurry video on Twitter - I can't find it now. It looked like some sort of rotating plastic trash bag :-).

[shapefrog]

https://www.youtube.com/watch?v=gHxi-HSgNPc - Is it this plastic bag?

[hgsgm]

Akso known as a balloon?

[Daniel_sk]

It had an irregular structure (Air Force described it as octagonal) and also balloon does not usually spin - especially not if they have a payload attached.