The Ronix Eight.3 Telescope CTN (400 lbs) V-Drive Sac is designed to fit in the rear compartment of any v-drive boat. This sac is also perfect for building a massive wakeboarding or wakesurfing wake behind a direct drive boat as it's size makes it the most versatile in the line. The width of the bag tapers from being the widest at the bottom to create a trapezoidal shape which Ronix coined, anti-roll technology. This means no more monitoring your bags. Just fill them and leave them. Ronix rethought and redesigned nearly every aspect of the wakeboard ballast bag. Constructed from a single layer of the same durable yet flexible material used to build white water rafts and Fly High Pro X series bags, the Ronix ballast bags offer unmatched strength and durability. All Ronix 8.3 ballast bags feature multiple sonic welded threaded ports built into the bags during construction.