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The durability of fuel containers constructed with composite materials may vary depending on design and materials of construction. Properly designed cylinders reinforced with either carbon, fiberglass, Kevlar®, or a combination thereof have proved to be sufficiently durable for the Natural Gas Vehicle fuel container application. Generally, fiberglass reinforcement is the most durable with respect to physical damage; and carbon fiber reinforcement is more susceptible to physical damage, but provides superior fatigue and environmental resistance. This paper discusses the durability tests (bonfire, gunfire, drop, pendulum impact, and flaw tolerance) required by the American National Standard (ANSI), AGA NGV2, Basic Requirements for Compressed Natural Gas Vehicle (NGV) Fuel Containers; and the results of these tests performed on two (2) lightweight “all-composite” fuel container configurations.