The audio titled "Polythene Sack" begins with the familiar rustling sound of a plastic bag being handled. It's the kind of noise we associate with a trip to the grocery store, perhaps when we're packing away fruits and vegetables. The plastic bag in question seems to be of the zip-lock variety, as there's a distinct clicking sound that follows, indicating the opening and closing of a seal. Throughout the audio, the emphasis is on the unique texture and utility of the plastic bag. It's a familiar yet often overlooked aspect of our daily lives. The rhythmic crinkling sound adds an almost musical element to the audio, painting an auditory picture of the common, yet indispensable, polythene sack.