Shelving for bathrooms and toilets - where to buy?

[OM2]

I want to add some shelving high up in a bathroom and also one for a toilet.
I want to be able to store loo rolls up there. No space anywhere else.

What kind of shelving should I get?
100% plastic - to avoid water damage over time - this is what I thought would be the answer.
Plastic shelves don't seem to exist!

Not sure what to get.
Thanks.

 

[big-all]

go for something like pine shelve /kits
pine works well in moist situations as tiles and glass normally attract the excess moisture rather than the pine

as an aside plastic as a non absorbent layer can gather droplets [water ] if cold enough