I tell them to bring their own and whatever they are comfortable with. Id rather have them fill their drybag with TP than something heavy.
Then i bring two extra rolls of the cheapest roughest stuff i can find, just in case they have underestimated their powers
Never had anyone run out AFTER the first trip!!!
Now while on the subject, time to put down the phone, wipe, flush, and get back to work!!!!
Hey, if you want me to take a dump in a box and mark it "guaranteed", I will. I got spare time.