Polyamide, polyester Hydration Streamer Hose Dowel Built-in and detachable raincoat Compatible with hydration system up to 3 liters The Deuter AC LITE 28 liter backpack is a comfortable and functional attack backpack for fast trails, crossings, hiking, walks or via ferratas. The AC LITE backpacks offer a true revolution in comfort with the back screen system, the Airconfort system that combines lightness, flexibility and freedom of movement with maximum ventilation.