Used one of these season after season. Folds up into a steering wheel sized package, weighs nothing and is indestructible. Porti-potti and shower
https://www.amazon.com/s/ref=sr_st_price-asc-rank?keywords=popup+changing+tent&rh=i%3Aaps%2Ck%3Apopup+changing+tent&qid=1526943712&sort=price-asc-rank
https://www.amazon.com/s/ref=sr_st_price-asc-rank?keywords=popup+changing+tent&rh=i%3Aaps%2Ck%3Apopup+changing+tent&qid=1526943712&sort=price-asc-rank