A package includes a casing of made sheet material defining an inner volume, the casing including first lateral walls defining a first passage opening delimited by a first free edge, the casing including an engagement portion extending from a lateral wall of the first lateral walls inside of the inner volume to provide a projection, wherein the engagement portion extends from the first free edge of the casing in a direction towards the inner volume. The package also includes a container made of sheet material, separate from the casing, and configured for housing a product, the container comprising second lateral walls defining a second passage opening delimited by a second free edge, the second passage opening of the container being configured for insertion and withdrawal of the product from the container, and the container being configurable between first and second operative positions.