2) what to do with your dirty diaper
3) does the lock work or notthere is no way around the lack of space in a port a potty just as you'd find in an airplane bathroom. its irritating and quite a few times, very important items like my phone or e-cigarette have come periously close to taking the death plunge from my shirt pocket into the urine/poop abyss, but port a potty's are for emergencies whether you are continent and scrambling to find a toilet so you dont pee or poop in your pants for the first time since you were a small child or completely dependent on diapers like i am and are close to leaking or have soiled your diaper and need to change quick, the port a potty is a savior of sorts and you just deal with the minor challenges.of course once you change you have a diaper you have to do something with. you can leave it inside as punishment for there not being a waste receptacle inside and i have done that in a pinch but usually i just bring plastic grocery sacks and if i know there is a garbage nearby, i know i can toss the plastic bag wrapped soiled diaper away quickly. if not, just leave it. not worth the embarrassment of running into someone with a dirty diaper in your hand.so the porta potty epic fail is the 3rd item...ALWAYS check the lock. I didnt today and in the middle of changing my poopy diaper a middle aged woman with what appeared to be a 6 year old boy all of a sudden opens the door. needless to say, they got an eyeful and i was royally embarrassed, more than i have been in a long time. to make matters worse when i was done, they were outside waiting and im holding a bag with a dirty diaper in it. the mom couldn't look at me and said nothing, the boy did an out of the mouth of babes and said "its okay, my younger brother is 4 and he still wears diapers. my mommy says every body learns to use the potty in their own time.Check the locks!