This aluminum flask was made at the Leningrad plant "Красный Выборжец ",
a famous manufacturer of ammunition for the Red Army.
A flask, a mug, a spoon and a mess kit were included in the Red Army soldier's field equipment.
At the bottom of the flask you can see the stamp "Красный Выборжец 1939"/ “Red Vyborgets 1939”.
The reverse side has a concavity, as if it was bent, but why is not clear.
Canvas cover, probably later.