In the audio titled "Sack", the predominant emphasis revolves around a heavy bag. The bag seems to be made of a rough, durable material, perhaps canvas, suggesting its capacity to carry significant weight. Periodically, there's a resounding noise indicating the shifting of contents within the bag. Amidst the subtle background noise, the rhythmic sound of footsteps becomes noticeable, invoking the imagery of someone walking, perhaps the carrier of the sack. The steps echo consistently, indicating a steady pace, perhaps a walk of purpose or necessity. Additionally, the crinkling sound of plastic can be discerned intermittently. It could be the rustling of items wrapped in plastic inside the sack, or perhaps the bag itself has a plastic lining. The audio masterfully blends these elements, painting a vivid picture of a person walking with a heavy canvas sack, filled with items wrapped in plastic.