1. About the ZINZ BAG Shoulder Strap: ZINZ universal bag strap can replace any broken straps of any bag with D-rings or other devices. Specially designed for shoulder bag/laptop computer bag/briefcase/messenger bag/travel bag/diaper bag/tool bag/guitar bag. Professional package. 24-hour after-sale service. 30-day money back for ZINZ shoulder strap. 2. Fixed Shoulder Pads: Soft, breathable cloth. No need to worry about the pads slipping and hurting your shoulder due to heavy bag. Less pain and fatigue on the shoulder. Feel lighter than its real weight. Anti-slip surface prevents the strap from slipping off the shoulder. 3. Double Balanced Buckle: Double balanced buckles make the shoulder force more even, making bags feel 50% lighter. With a non-slip design, the double closures are stable and the shoulder strap length won't change simply due to the bag's weight shift. 4. Adjustable strap on both sides: Nylon material with dual symmetrical buckles. Adjustable length from 110 to 200 cm. Suitable for people with a height of 1.5 to 2.3 m. 5. Swivel buckle: High-quality aluminum alloy is more solid and harder. Enough for a weight of 18 kg; the hook opening is larger than other regular straps. Rotates 360 degrees. Easily attaches to a D-ring or similar hardware.