Grid storage boxes intended for routine handling and long term storage of 50 standard size TEM grids, incorporating a range of features for improved ergonomics and handling. Each box is made of anti-static material, and is designed to be securely stacked with other boxes, the base of one box locating precisely over the face of another. The box's rotating cover design overcomes many of the disadvantages of traditional sliding covers, exposing a maximum of two or three diamond-shaped holes at any time. The smooth rotating action offers easy 360° movement while keeping in close contact with the base, and a 'park' position prevents the cover opening during storage. Individually numbered boxes are also available on request.