Cold air sinks, which helps keep the contents ... Use large blocks of ice and ice packs. Keep the cooler in the shade and ...

Next, line the bottom with ice packs. If you need more than what ... can easily reach in and find them without leaving the cooler open for too long. Always latch it all the way so none of the cold air ...

Here's how long the ice packs lasted in each ... In general, when there's more air space in a cooler, ice melts faster. So, the fact the larger cooler won out is a real testament to its insulation ...