A plastic container comprising a box and a lid. The box has a bottom portion and first and second pairs of opposing walls rising from the bottom portion to define an internal space of the container, and the upper edges of the walls are adapted to support the lid and comprise a flanges that extend outwards from the inner space. The lid is adapted to leave an outer portion of said flanges free along the entire length of the walls of the first pair when the lid is applied to the box. The lid can optionally be removed, even if the box is inserted in a rack where the flanges are supported by a guide.