Amazon.com: MRE Flameless Heater - CASE of 24 : Tools & Home Improvement
Daily tip from a line-medic; the MRE heater pack uses a chemical exothermic reaction to heat food to 100-200⁰F and release Hydrogen gas. Using them in confined spaces (buggy/truck) or using them
Flameless Ration Heater Bag – Defence Q Store
Water Reactive Army Food Heater Bag Military Mre Heater Flameless Ration Heater - China Flameless Ration Heater and Mre Heater