KISS
No portapotti, no seat of any kind. WAG bags, simple way to take care of the daily duties. You go outside, open the package, spread out the appropriate bag on the ground, do a bombing run over the target, grab the bag, shake it up to spread the magic enzymes, seal everything up in the small outer bag, and toss it in the trash when you can.
No muss, no fuss, no odor, no searching for the prefect spot, we are not leaving a treasure behind for the next visitor to find, and we are not carrying around floaters in a bucket in the camper.
x2 on the PETT Wag bags.
Easy to use and good for multiple uses. I use the bags with the folding seat when camping in the truck. I bought the seat when I had a hurt knee and had a hard time squatting, now I like the seat because it is relaxing to use.
It is a good alternative to a holding tank system.