Anaconda have a 20ltr Camping toilet-"with flip top box"--$29.99 + $10 postage if you want t delivered.
https://www.anacondastores.com/medi...jIxNjM3MTc2ODYyMGViZTA4ZjZlODY2ZDdjZjMxZjlmNg
https://www.anacondastores.com/medi...jIxNjM3MTc2ODYyMGViZTA4ZjZlODY2ZDdjZjMxZjlmNg