Let’s start by imagining a rubber tube, packed tightly with little rubber pellets. You now take out the huge mallet that you just purchased and give one end of the tube a good whack! Due to the compact nature of the tube, much of the force exerted from the strike will travel to the other end of the tube.
Now imagine this same rubber tube is loosely packed, and we give it the same forceful whack at one end. The tube now gets squished by the mallet, flattens out, and force from the strike dissipates from the squished area in a sideways fashion. Consequently, most of the force never reaches the other end.