They are UN-compliant jugs for shipping liquids. They are also food grade (in at least some flavors) so are suitable for potable water. They can be bought new f

They are UN-compliant jugs for shipping liquids. They are also food grade (in at least some flavors) so are suitable for potable water. They can be bought new for ~30 bucks or so from McMaster, presumably less elsewhere. Really common if your selling/buying anything liquid in > 1 gallon but less than an IBC (those metal framed plastic cubes). So not so much the consumer space, but lots of b2b or industrial supply type places use them. They are also quite rugged so they make a good candidate for reuse.