World War II (probably after 1941)
|LIFE photograph by George Strock, 1941|
Interestingly, no fabric recommendations are made, and yardages are given only for 35" wide material, so I'm assuming the Red Cross made recommendations or supplied the fabric.
The Red Cross museum site has a nice overview of WW II canteens here. Make sure you scroll all the way to the bottom for a link to a PDF that will tell you how to recreate a WWII canteen.
The Red Cross also offered home nursing courses during the war, in part to mitigate the shortage of doctors.