The Topeak MTS Trunkbag EX Strap Mount 8L in black offers an 8-liter capacity with insulating rigid molded EVA foam side panels and durable 420 denier nylon fabric for rigidity and water repellency. It includes a divided main compartment, two mesh side pockets for organization, and a rear water bottle holder. The bag attaches to your bike rack with Velcro straps and features a carrying handle, shoulder strap, 3M reflective strip, taillight clip, and bungees for convenience.