Travel Potty (for potty training) (Leamington Spa (CV32))

Hi there all you great free-cyclers and freeglers,
Our 3-year old twins are embarking on their potty training journey.
We are sorted for potties at home, but a travel one would really help should we get caught short on longer car journeys.
Does anyone have a travel potty (one that collapses down) that they no longer need?
Thanks in advance.
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