Under the retro steel shell is a 4-liter interior lined with closed-cell foam, radiation-reflective paint, and a raised floor to keep cans off any meltwater, sealed by a gasketed, airtight lid. Fieldbar rates it to keep drinks below 10°C (50°F) for up to 24 hours in the shade, and it fits six 330ml cans in a shell that weighs about a kilogram empty. It sells for $229.