They're rubbish bins (or perhaps textile recycling bins, but probably not) specifically for national, regional, and/or local flags.
Edited to clarify: No judgment, I am not making a political or societal argument, just posting about a thing I learned exists. If this post gets hijacked I'll ask the mods to lock it.
TIL, that's actually make sense
This YouTube channel is an awesome resource for anyone (athiest, theist, alien anthropologist) to understand the effects of religion on the world from an impartial point of view.