Bladder tanks from Husky Portable Containment are available in 25- to 50,000-gallon capacities. They are manufactured to meet military or commercial specifications and are constructed from XRs, PVCs and urethanes (MIL spec), with PVC (NSF 61), aluminum, stainless steel and brass fittings from 3/4 to 6 inches. They include all stainless steel hardware, access panels, maneuvering straps near the corners and every 5 inches down the sides, flame arrestors, double T-style and mushroom vents, and field repair kits. Storage bags are included with optional ground covers and sun screens in various weights available. 800/260-9950; www.huskyportable.com.