Crate comprising: - a bottom wall, two longitudinal walls and two transverse walls disposed in such a way that the crate has a tapered shape with increasing dimensions going from the bottom wall upwards in order to permit the insertion of the crate inside a lower crate that is identical to the crate, - longitudinal guides disposed under the bottom wall of the crate, and - two shelves slidingly mounted in said longitudinal guides, wherein each shelf can be: a) in an extracted position, wherein a front edge of the shelf protrudes externally with respect to the bottom wall of the crate in order to be stopped and supported on an upper edge of the transverse walls of the lower crate, in such a way to stack the crate on the lower crate; b) in a retracted position, wherein the front edge of the shelf does not protrude externally with respect to the bottom wall of the crate in such a way to not hinder the insertion of the crate inside the lower crate, characterized in that said shelf comprises a slider provided with a front edge that faces the exterior of the crate, and retention teeth disposed under said front edge; said slider being slidingly mounted on said shelf in such a way to be disposed: a) in a retracted position, wherein the front edge and the retention teeth of the slider are retracted with respect to the front edge of the shelf; and b) in an extracted position, wherein the front edge and the retention teeth of the slider are aligned with the front edge of the shelf and the retention teeth of the slider are engaged in locking slots obtained in the transverse walls of said lower crate. - a bottom wall, two longitudinal walls and two transverse walls disposed in such a way that the crate has a tapered shape with increasing dimensions going from the bottom wall upwards in order to permit the insertion of the crate inside a lower crate that is identical to the crate, - longitudinal guides disposed under the bottom wall of the crate, and - two shelves slidingly mounted in said longitudinal guides, wherein each shelf can be: a) in an extracted position, wherein a front edge of the shelf protrudes externally with respect to the bottom wall of the crate in order to be stopped and supported on an upper edge of the transverse walls of the lower crate, in such a way to stack the crate on the lower crate; b) in a retracted position, wherein the front edge of the shelf does not protrude externally with respect to the bottom wall of the crate in such a way to not hinder the insertion of the crate inside the lower crate, characterized in that said shelf comprises a slider provided with a front edge that faces the exterior of the crate, and retention teeth disposed under said front edge; said slider being slidingly mounted on said shelf in such a way to be disposed: a) in a retracted position, wherein the front edge and the retention teeth of the slider are retracted with respect to the front edge of the shelf; and b) in an extracted position, wherein the front edge and the retention teeth of the slider are aligned with the front edge of the shelf and the retention teeth of the slider are engaged in locking slots obtained in the transverse walls of said lower crate. a) in an extracted position, wherein a front edge of the shelf protrudes externally with respect to the bottom wall of the crate in order to be stopped and supported on an upper edge of the transverse walls of the lower crate, in such a way to stack the crate on the lower crate; b) in a retracted position, wherein the front edge of the shelf does not protrude externally with respect to the bottom wall of the crate in such a way to not hinder the insertion of the crate inside the lower crate, characterized in that a) in a retracted position, wherein the front edge and the retention teeth of the slider are retracted with respect to the front edge of the shelf; and b) in an extracted position, wherein the front edge and the retention teeth of the slider are aligned with the front edge of the shelf and the retention teeth of the slider are engaged in locking slots obtained in the transverse walls of said lower crate.