I am selling this bag because it doesn't fit all the contents of my current bag, and the size was not suitable. It comes with a strap. The strap is black, but it's a color that's close to gray. topology Topologie Bottle Sacoche Strap Shoulder bag Color: Black "Product Description" Bottle Sacoche A sustainable pouch designed to conveniently store and carry a tumbler bottle, smartphone, keys, wallet, and other belongings. Perfect for light travel, it also reduces plastic waste from plastic bottles. Customize it to your style with the Topologie Wares System strap. The new puffer material adds a soft, fluffy touch to the sophisticated design, providing comfort and style. - Dedicated compartment for storing bottles and umbrellas - 2 main zippered compartments - Numerous pockets for small items - internal organizer with key hook - Water-repellent fabric - A functional body bag that can hold a 500ml plastic bottle, made of nylon for durability. Color: Black系 (Black-based)