Fully featured expandable trunk bag with expanding main compartment and drop down sides that take it from 9L (550 c.i.) to 36L (2197 c.i.) of capacityCustomer requested additions such as adjustable dividers, ice pack compartment and elastic cords for taking extra layers for unpredictable weatherMesh helmet holder on the exterior keeps your helmet safe and secure during stops for provisionsWaterproof design and polyester materials keep your gear dry should you run into inclement weatherAvailable with or without pre-installed MIK adapter plateVelcro Straps2197 c.i.Black/GreenXXX-Large (700+ c.i.)