The Letterkenny pack is neat. I used to have plenty of them. The neat thing about them is you could open it up and it could range from a used serviceable late sling, to a new unused WWII, including Khaki.
I still have a couple unopened in my reference library.
Also in my library is a contract to Mildew Resistant Treat individual slings. The contract is impossible to read, but the company was Practical Fabrics from 1965. I have not been able to find the location of the company, but I suspect it was in New York State, possibly near Utica.
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