The Dual Sternum Strap Adjuster can assist the shoulder straps to prevent the shoulder straps from slipping and the backpack from swinging left and right. Generally, after the shoulder straps are adjusted, the position of the Dual Sternum Strap Adjuster is automatically adjusted. During the use of the chest buckle, the tightness can be adjusted according to the size of the user's bust.

Chest buckles are generally used in leisure backpacks, outdoor sports backpacks and school bags, and are rarely used in business backpacks, mainly because the Dual Sternum Strap Adjuster does not match the formal sense of business backpacks, so it is rarely used in business backpacks. to the Dual Sternum Strap Adjuster. However, like outdoor sports backpacks and student schoolbags, due to the relatively high requirements for backpacks and the relatively large weight of backpacks, chest buckles are often used to reduce the pressure on backpacks and give users a more relaxed carrying experience.