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@Jim SoG,
@M Rose, if meaning the GI jerrys that are shown in this image at the surplus place, those are metal cans, and while still military issue, perhaps, are not the rugged plastic military issue from
BuyLCI.com that
@bgenlvtex has in his vehicle, or was talking about in
this post.
Having used both over the years for fuel and water, I think most folks, for camping and adventure, will find the rugged plastic ones to be far more suitable as far as longevity, maintenance, and storage. The pour caps are much different on the metal GI cans. They have a seam running around the middle, which over time is likely to rust.
They metal cans will also be more prone to puncture and pinholes, and will not flex as much in heat, so possibly force water or fuel out. Easy to release the pressure in the plastic jerrys (advised if you keep them exposed on hot days), while trying to do so with the metal cans often gushes water or fuel out unless you're used to the process.
The metal GI cans need gaskets, as well (see sign at the top of the shelves), which eventually need replacing from dry rot or misuse. No gasket, more leakage. The plastic ones do not. In experimenting with the plastic LCI jugs I bought almost four years ago (about the same price then as now) I've found they do not need gaskets or o-rings on any of the three openings. There's an old thread here somewhere on just that.
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