The gray areas are reflectors, providing high visibility when illuminated by headlights at night. Will be shipped after simple cleaning. A U-lock for a bicycle can be attached to the back. - Color: Black - Strap Type: Adjustable shoulder strap - Inner Material: Silver lining - Outer Material: Nylon and synthetic materials - Pockets: Zipper pocket on the outside - Design: Simple and functional design Thank you for viewing.