Since most on hear claim they know so much of the industry I'd like to point out that there is not trash bags covering splices, regardless of the ILEC. That for the OSP challenged is slicker cloth and it is an approved means to cover the plant.
I'm sure your right about the point that it's not a trash bag. They degrade in sunlight pretty fast, by design.
But the "slicker cloth" can't be intended to be a permanent install, can it?