A toilet seat covers works by attaching the cover firmly to the lid of the toilet seat. This is usually done with suction cups or clasps. A portable potty is usually a foldable plastic suitcase-like toilet. Some come with plastic liners to put on the inside, and some opt not to. By opening the lid and putting a plastic liner in, your toddler or the person you’re caring for can use the bathroom in a throwaway bag. The travel potties without throwaway bags must be cleaned by hand.