An army aluminum flask with a cover, this is another one and now we can say for sure an irreplaceable military item. A person must consume water daily, and an army flask will just be a reserve. Soldier’s flask with a volume of 0.7 liters or 700 grams.
Of course, you can take a flask for fishing and hunting, and fill it with a completely different “NZ”
The cover allows you to attach it to the waist belt. Very comfortably.