1. About the shoulder strap: Universal bag strap can replace any broken straps of any bag with D-rings or other devices. Specially for Shoulder Bag/Laptop Computer Bag/Briefcase/Messenger Bag/Travel Bag/Diaper Bag/Tool Bag/Guitar Bag Professional Package. 2. Fixed Shoulder Pads: Soft breathable cloth, don't worry about the pads slipping and hurting your shoulder due to heavy bag. Less shoulder pain and fatigue. Feel lighter than its real weight. Anti-slip surface prevents the band from slipping off the shoulder. 3. Double Balanced Buckle: Double balanced buckles, make shoulder force more even, make bags feel 50% lighter. With non-slip design, the double clasps are stable and will not change the length of the shoulder strap solely due to the weight shift of the bag. 4. Adjustable strap on both sides: Nylon material with dual symmetrical buckles, adjustable length from 94 to 147 cm, suitable for people with a height of 1.5 to 1.8 m. 5. Swivel Lock: High quality aluminum alloy is more solid and hard, enough for the weight of 18kg; The hook opening is larger than other normal straps, 360 degree rotation, easier to attach to D-ring or similar hardware.