I've seen an advertisement for size 8 pampers baby dry diapers but I've never seen them in stores yet.
Maybe the size 8 pampers baby dry diapers are only currently available in some other countries and not the USA yet.
I've searched Google for Pampers baby dry size 8 diapers and I do see them listed on Amazon but only in the UK so I guess there are size 8 Pampers baby dry diapers but only available to those in the UK.
I don't think size 8 diapers are available in the USA right now but they might be in the future if there is enough demand for them.
I can see size 8 pampers being useful for older kids who cannot be potty trained due to disabilities so it can be a good idea.