so....dragging this thread back....

I got a small coleman cooler that promised 3 days of ice,put sodas/ice in it...it melted by the next day into water.

each day-refill ice,it melts.I am returning it this week to WM. It was in the shade,and not hotter than 80 any given day- I would assume the 5 day has a bad actual use record too?
...AND...a dry ice question -can it be sealed in a bag in the cooler,or does it need a vent of some sort? Not too sure,but thinking it's the best option for us next trip.....