Ooooh, I like the Pringles idea. The cardboard component can also be used as a fire-starter in a pinch. I imagine it would make an ideal container for carrying a Caldera Cone and accessories...
On the other hand, the tennis ball can can also be used as an in-tent emergency pee-pot for those really wet nights, or carrying anything wet. I'm not sure if the Pringles can would hold up to prolonged moisture?
The real question here is: How much does an empty tennis ball can weigh?? Are there lighter alternatives that would do the same job?