In the episode Polymorph, as Lister is serving dinner with all re-purposed medical equipment, he pulls out some red wine in a clear glass vessel that was sitting on its side. The audience members are all grossed out, so I'm wondering if it has a specific purpose I'm missing, probably medical/body fluid related?
I don't have enough reputation to comment on the above answer, but wished to provide a more accurate response.
This is a glass urine bottle for use by bed-bound patients.
For guys of a certain age, this brings back memories of embarrassment, the thought of spillages in bed, and of it being thrust upon you by stern looking matrons.