This is an ad put out by the metro de São Paulo. It’s supposed to encourage people to stop wearing enormous backpacks* on the subway and bus because doing so is annoying to other travelers**.
* Enormous backpacks that you could totally live inside because… have we mentioned how enormous it is?!
** Could they have maybe worked a little harder to make it look like those other people were anywhere near said enormous backpack?
Thanks for sending this to us, Antonio! You can find this image online on Facebook.