No, it’s not a tissue box.
Check this out. It’s a disposable potty. It’s basically a small cardboard box with a hole in the top and a hygenic liner inside. It’s primitive, but it will do the trick in a pinch. As I see it, there’s no reason not to keep one or two in the trunk of the car. The best part is that a large portion of the company’s proceeds goes towards promoting the early detection of breast cancer. They are affiliated with monthlybreastexam.org, though I can’t find any mention of the potty on their site. Hmmm.