@Naomi I've seen those however it's not portable haha. How do you encourage not peeing in nappy?
We went shopping and got him to choose some pants, then the next day we just stopped nappies all together (apart from at night). You have to go just go for it and obviously there a many accidents to begin with but they won’t learn unless they have accidentsin there pants and it’s wet and uncomfortable. Just always take loads of spare cloths out with you. Get some books so you can read about using the toilet to him to plant the seed that this is coming. It took about 1 month for us to get totally dry (not at night).
We found out toddler hated the potty (even though we took him shopping to buy it) he just wanted to use the big toilet so we go one of those ladder seats and he loves it. He can do it all by himself and flush the toilet etc just like the adults!