A whole roll???
I suppose -- if -- you are car camping with family or larger group...
I have a single use of tp stored in the handle of my plastic gardening shovel (for cat holes). I also have numerous packets of MRE tp that I can bring along and store in zip loc baggies. Store in multiple convenient locations. But then again I have also aclimatized myself to using natural materials for cleaning up.
Oh, I dunno. Sometimes it comes in handy. My brother did a camping trip with Boy Scouts about 15 years ago; at the time I was an assistant adult leader. We were going to split an entire roll for the 7-day trip (makes sense, right?). On night one of the trip, his tent buddy downs a whole can of diced pineapples. He also happens to have bad citrus allergies. After having explosive ... issues ... he runs out of his TP, and uses ALL of ours.
Fortunately, one of the other adults ran to a 99-cent store and bought us a replacement roll for the remainder of the trip, after first dropping the Scout off with his dad in the parking lot.
Point is, sometimes you can't have enough.