Features & Options: Enviropac Inc. is a major supplier of storage tanks for the fertilizer and industrial markets. Tanks include fiberglass, mild steel, stainless steel and poly. In addition, we supply the Hunter Plia-Tank, with capacities up to 600,000 gallons. Tanks are available in standard or custom design for specific application. With the cost of steel increasing dramatically, fiberglass tanks are the tank of choice for many dealers.