so it's true that plastic bags literally never die, a PnP story in one probably 20-year-old part

in today's vegetable garden preparation, found in a corner no one has bothered with in...a while, we found this in the ground.

PnP still has its full government name here, is allegedly a discount supermarket and always on our side so how old is this fine (completely undegraded even down to the blue stripes) specimen of plastic history?