This Canadian Forces Food Packet Survival Supplementary Air is a restricted calorie 72 hour ration issued to pilots and are also part of more comprehensive survival kits stowed away on aircraft. A fascinating throwback of an emergency ration that resembles one of maybe the 50's or 60's in terms of it's contents and overall effectiveness. And thank you everyone for watching & subscribing - hope you enjoyed this one, as I certainly did making it! -Steve