The 211L part of Marathon is a portable, self-contained, dust-free, watertight, and airtight cabinet system suitable for long-term storage of both hazardous and non-hazardous materials. It is designed to provide long-term protection of high-value and sensitive items, such as chemicals and other flammable or combustible liquids. It features an adjustable shelving system and adjustable side panels that can be configured to fit containers of varying sizes and shapes. It also comes outfitted with an adjustable two-piece lid designed to provide unobstructed access during loading and unloading, an automatic pressure lock to ensure an airtight seal when the lid is closed, and a padlock hasp for added security. It is a sturdy, industrial-grade unit that is designed for long-term storage of hazardous and non-hazardous materials, and is certified for a variety of hazardous locations.