Abstract: Grain storage is provided by a unit having a aboveground retaining wall structure, a floor liner and a cover liner. The wall structure is preferably formed from an earthwork berm and typically has a generally rectangular shape having two parallel side walls and at least one end wall. The area enclosed by the retaining wall structure is covered with a floor liner member on top of which the grain may be deposited. As the area is being filled, the grain is covered with the cover liner. After the unit is completely filled and covered the floor and cover liners are sealed together to form an airtight grain storage compartment in which the grain may be maintained for long periods of time. After sealing the liner together the excess air trapped within the grain storage compartment is preferably removed and the sealed edges of the floor and cover liners are buried in a trench provided around the outside of the retaining wall structure.