We live in a dry cabin and have an outhouse, but when it is -40F, NO ONE wants to go out there. So we have a porta potty in our "shower room". It is a 5 gallon bucket with a toilet seat lid that is made for them. I line the bucket with a tall kitchen trash bag. Make sure to get all the air that you can out from between the bag and the bucket. Pop the seat/lid on and use..... Then every few days I empty the bucket in the outhouse and put the bag in a big black garbage bag that stays in the outhouse. Every couple of weeks I take that bag to the transfer site. Of course it is all frozen at that point. It works well for us. In our previous dry cabin we didn't have a shower room so I just curtained off a corner for the potty room. I used to use wood shavings or kitty litter in there but found it is really not needed as it doesn't smell other then a bit when you are in there "going".