Abstract: A portable toilet training seat. The system features a foldable U-shaped spacer which is placed on top of a standard toilet seat in a public restroom, providing a reduced diameter seat for the child. A banana shaped storage bag is provided to accommodate a half-folded spacer. The storage bag is reusable and machine washable, but contains a vinyl insert intended to isolate the spacer from the bag itself. Both the storage bag and the insert are configured so as to be reversible. The insert is heat-resistant and dishwasher safe. A sanitizing spray may be provided with the invention to form a kit.