Eureka!

I may have found the solution to the portajon problem!
Air!

(Shitter's full, it's 130 degrees out, and you can't hold your breath and complete the transaction in the same amount of time.)

I think this'll fit over the exhaust tube on the top that is supposed to let the noxious fumes get out!

Drat!... Their shopping cart doesn't do APO addresses. Damn. Where the hell did I leave my gas mask?

Chuck