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I saw this posted on BushcraftUSA and the poster didn't go into detail about it's origins.

I'm guessing it isn't US issue as the only canteens I've ever seen are the standard 1 QT canteen and the rectangular 2 QT canteen.

Whoever this is seems to have put one one of those "canteen into camelbak" conversion kits on it.

try and get a nsn

looks avaiator-like to me they always get the fancy stuff

But it has a NBC cap so ???

It could be a use with their helemts i guess like the foods through the tube

FDSman,

I have one of those canteen cap converters. I picked one up in 2003 in Ft. Leonard Wood, MO for a standard 2qt canteen. It's very handy and inexpensive. The only drawback is that you have to blow air into 1/3 of the canteen and then turn it over to get the air into the bottom then get it right side up thereby puting upward pressure and using momentum to drink the water. I think a company called SPEC-OPS made the cap system. The company is kind of innovative in that they make good quality stuff, for not a lot a money and it lasts. They're still around IIRC.

As for the bladder, I've never seen that one before but it looks like a 3L rectangular version, similar to a camelback.

Those NBC canteen caps were a pain to use until you got used to them, but they would certainly save the embarrassment of getting a mouthful of Sarin......