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We're going to get one of these for this summer. Can't seem to find out on the internet though what you put in to keep them cool. They have a draingae sump which suggests ice, but then you can buy flexible cool packs for them too.
So, how do they work, anyone know?

Thanks

Try a couple of 1.1/2 litre Cola  plastic bottles full of water frozen in your freezer at home before you go.