This helps alleviate the shoulder strap from digging into your shoulder due to the weight of the water bottle. It also serves as a marker for your own water bottle, preventing you from accidentally taking the wrong one. It can be used with shoulder straps that can be detached from the water bottle itself and are within 4.5cm in width. Size: Length...approx. 20cm Width...approx. 6cm Please consider this item, as it is handmade by an amateur (◡ ω ◡) #ShoulderBeltCover - Design: Unicorn and Rainbow Pattern - Colors: Light Blue and Pink - Material: Quilted Fabric - Edging: Pink rope edging Thank you for viewing.