Modular Shooting Bag System with Secure Stack DesignThe Crucial Sight Stack combo includes a V bag and base with velcro straps that allow secure customizable stacking with other bags in the system. Pre filled with recycled rubber media it delivers ideal weight and stability while the textured PVC top provides enhanced grip on the firearm forend. Velcro straps enable modular stacking Pre filled with recycled rubber media Textured PVC top improves grip Four piece set for versatile setups Designed for stability and control