A chest strap on the backpack should always be attached at the height of the breastbone. This ensures optimal weight distribution and relieves the back. It also prevents the backpack from slipping and gives the wearer more stability when hiking or climbing. A chest strap that is too high or too low, on the other hand, can lead to uncomfortable pressure points and restrict freedom of movement. It is therefore important to properly adjust the chest strap and adjust it if necessary to ensure maximum comfort and safety.