Carry some freezer-strength ziploc bags in your diaper bag/purse to lock in the stench of dirty diapers, or wet clothes. This is a great idea because sometimes you are in a place (like the Church bathroom) where you are not sure how often they change the trash. You don’t want to leave a nasty smell for every other patron of said bathroom. This is also great for travelling when you will need to wait a while before hitting a trash can: simply zip up the smell and wait until you find a trash can. Finally I use this trick when a diaper is particularly nasty here at home.
It works for me!