Teejay
Teejay, not sure if this is the one you were thinking of when you mentioned disaster relief but try searching for the PETT toilet system.
Bags are fully degradable. The toliet itself actually feels like sitting on a proper loo with a seat (big plus compared to boginabag), tales seconds to set up (quicker than a popaloo).
Only downside is cost...but it's the best thing we've purchased for the van and no where near the most expensive.
PETT that's the one. I did find it eventually it after several web searches. Nice to know some one has tried it and rates it. Many places seem to be out of stock.