Those plastic bags and flavor packs that come in kits. They have those big plastic spout things on them that you are supposed to open and pour the juice out of. Um, how the heck do you get the lid off the darn things??? I have resorted to just cutting a hole in the darn bags and pouring the liquid out that way because I can't figure out how to get the top off. I know, stupid, but I can handle all the chemicals, cleaning, sanitizing....I just can't open them!!!