The Sternum Strap connects the left and right Harness Shoulder
Straps at the centre of the chest. The Sternum Strap distributes
some of the backpack weight across the chest, prevents the Harness
Shoulder Straps from drifting onto the shoulder joint or slipping
off the shoulder, and positions the Harness Shoulder Straps comfortably
flat on the chest.
The correct position of the Sternum Strap when wearing a backpack
is in the middle of the sternum or breastbone. If the Sternum Strap
is lower or higher than this position it may interfere with effective
breathing. It is important that you do not over tension the Sternum
Strap as this would prevent the Harness Shoulder Straps from making
full flat contact on the chest.
White Mountain™ recommend always using a correctly positioned
Sternum Strap if available, particularly on extended walks or when
carrying heavier loads. When climbing, bending over, or scrambling
over rough terrain the Sternum Strap will ensure greater backpack
comfort under load. The Sternum Strap is necessary for Harness Shoulder
Strap positioning and comfort, and works best when the Harness Shoulder
Strap is correctly adjusted to the Individuals Torso Length.