NP......

Maybe talk to local hospitals, take their buyer out for a beer or 2, then ask to buy a small quantity for yourself at their cost plus "maybe" a small markup.
Hey, maybe it costs a few beers to get exactly what you want?
If you don't ask, you'll never know.

I still do quart sized zip baggies and toss them overboard. I should really look into an external catheter since most XC ships I fly have the rest.

I wonder how many pilots have forgotten to disconnect from the ship tubing BEFORE exiting the ship? Regardless of at home, field or emergency......
"Yep, it's 20" long..........but only 1/4" in diameter".
You metric types can convert.....but, you get the idea......