avoid "Extra Strong"
The shake in a jar of water is an excellent test. Also look for septic tank safe somewhere on the packaging.
The cheaper the better - the ones with lotion, aloe, or extra strength will clog. If you are traveling, anything in the black tank will be shaken to a slurry if you have enough water in the tank. If you camp for a couple of weeks at one location, then problems can crop up or worsen.
Kleenex tissues (or any other brand of nose wipes) are designed to hold together much more than TP, so don't use them just because you're out of TP.
If you ever do get a paper clog, don't forget that throwing about 5 lbs of icecubes down the toilet followed by a long ride down a coutry road will scrub anything out (other than the Barbie Doll head your nephew put down there).
Yesterday is history,
Tomorrow is a mystery,
Today is a gift,
that's why they call it the present.