Trying to ID these bags purchased ~1980 ...

[voyaager]

I bought these bags in 1980.
I had seen them around surplus stores off and on for several years.
I think I had seen them with medical and /or chemical insignias stenciled on them.
I bought these to use as saddlebags for a motorcycle road trip to Alaska.
They did the job nicely.

They came with "CY - I064A/ATC" stenciled on them.
So, my question is: What are they?

EDIT:
I took a look inside one of the bags and found stenciled on the inside end of the bag:
ORTHOPEDIC EQUIPMENT CO., INC
USA 120-68-C-3448

This lends credence to my calling them medical duffels through the years.

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