CamelBak ThermoBak Hydration System, NSN 8465-01-532-6425, DUC (Digital Universal Camo) Digital Universal Camouflage (DUC) Pattern Use D-ring attachment points to add to any armor vest or pack with MOLLE. Fully-insulated reservoir compartment using 7 mm closed cell foam. Add or remove name tags and unit badges quickly with integrated hook-and-loop. External fill for rapid refill without having to remove reservoir from pack. 500D Cordura Fabric