The links you find googling biodegradable toilet paper and portable toilet, etc-
http://www.cleanwaste.com/demo/go-anywhere-toiletReading those labels I swear those bog roll merchants have a hard time keeping a straight face. As you were folks, by buying that Quilton I've managed to save the worlds forests and reverse climate change for us all before lunchtime.
The puzzler was that biodegradable Kleenex Cottonelle. although you had to go to their website to discover that, unlike the blurb all over the wrapping from those Quilton brands, etc. So I thought hang about, they'll all be suitable for our sewerage system knowing the Gummint so I thought what happens to that unmushable Cottonelle after say an hour in plain water. Bingo! Shake it after an hour in water and it's just like the Quilton so pretty much any 3 ply you like folks.
Edit: Almost forgot. That's not true with those boxed Kleenex tissues you wipe your snoz on so I wouldn't drop them in the portapot. They're obviously made of sterner stuff and into the fire or bin for them.