UltraMax® fabric for maximum UV protection. UV-coated outer material. 100% waterproof PVC tarpaulin with electronically welded seams. Quick release strap system for easy attachment and refueling. Protective base material prevents slipping or marking. Main compartment has elastic loop in the base to help secure your belongings. Straps in base to help secure your belongings. Bag maintains shape and has reflective piping. Waterproof zipper flap protects from dust and dirt. Clear touchscreen device-friendly top pocket. Small mesh pocket under lid.