In the comments on my running yb default post, one of the more common responses was that people often have backpacks and a bouncing backpack is somewhere between "annoying" and "painful, risking bruising".
Running With a Backpack
In the comments on my running yb default post, one of the more common responses was that people often have backpacks and a bouncing backpack is somewhere between "annoying" and "painful, risking bruising".