You've seen the BSG ONE take a bullet, but does it keep drinks cold too? I had some time while I was smoking my Thanksgiving turkey to gather some data. It was sunny with a temperature in the low 60s. I set up a ThermoWorks ThermaData with 2 thermocouples to test a BSG ONE and a high quality Neoprene Koozie.
Here's the chart for the first hour. The beer I picked for the Neoprene happened to be slightly colder than the BSG ONE, but without getting all scientific on you, the performance is basically the same.