Jeans belt loop chafing skin. She doesn't like it.

Zinger has recently learned that if you do all of the following:

1) wear jeans with belt loops.

2) wear a belt.

3) carry a backpack.

4) running to catch a bus.

All of the above will result in the belt loop chafing skin on your back and cause open sore. This is because the bottom of the backpack rub against the belt on the back as you run. This pushes the belt loop against your skin.  And this rubbing on the skin causes an open sore.   

And if you repeate the above 4 items with different pair of jeans, then you will get another open sore at a different location because the belt loop location is different. She doesn't like it.