Dedicated insulin coolers vs cheap lunch bag: A lunch bag works fine for short trips

Dedicated coolers like Frio or Medicool add thermometers and consistent cooling, but a $10 insulated lunch bag with two gel packs wrapped in cloth protects insulin just as well for a few hours. Insulin degrades above 86°F and freezes below 36°F, so the cheap route is fine for work or weekend trips. Only spend on a medical cooler for overseas travel or all-day hot car use.