The Quarter Dome is a larger version of the Sentinel. It is made of Durathane™, which is 10 times more abrasion resistant than the vinyl-coated nylon used in most other haul bags! It has an RF welded main seam, forming a leak-proof seal that is stronger than the fabric itself. It has a double-layer ballistic lid with an internal zippered pocket for quick and easy storage of small items. This bag is well-padded, with a removable back pad and an ergonomically-cut suspension system that tucks away in seconds for hauling. It has virtually indestructible custom aluminum closure buckles, a top compression strap, and offset haul points.