I have another idea! Wait, it already exists...

Get a load of this - a flatform gas can that turns into a container when you need it to. And it's disposable when you're done. Just be sure to rinse before you toss...

.

Less than fresh

Don't you hate it when you're just freshly showered, are the cleanest you'll be all day, and then you are overcome with the need to make an emergency poopy?

So much for that squeaky-clean feeling...