Package comprising: at least one tray comprising: - a base, - a lateral wall transversally emerging from the base to define a containing seat adapted to receive the product, the lateral wall being delimited by a free edge opposite with respect to the base and defining an opening of the tray, the lateral wall comprising at least one movable portion configurable between: - at least one first stable position wherein the movable portion is placed in continuity with respect the lateral wall, and - at least one second stable position wherein said movable portion protrudes from the lateral wall and defines an access passing through the lateral wall itself; wherein the lateral wall comprises one or more of: - an angular portion exhibiting a concavity facing the containing seat of the tray, - a curved portion exhibiting a concavity facing the containing seat of the tray, said movable portion being defined at the angular portion and/or the curved portion; wherein the access is delimited by at least one free edge of the movable portion and by at least one intermediate edge of the lateral wall, and wherein the lateral wall comprises, at said angular portion and/or curved portion, at least one cut or one weakening line configured for promoting the formation, in the second stable position of the movable portion, of the free edge of the movable portion and of the intermediate edge of the lateral wall; at least one product, optionally of a food-type, received in the containing seat of the tray, at least one plastic film having a first portion preferably in contact with the product, and a second portion fluid-tightly engaged with an internal surface of the lateral wall of the tray not in contact with said product, said film cooperatively with said tray defining a fluid-tight closed volume, inside which said product is housed. at least one tray comprising: - a base, - a lateral wall transversally emerging from the base to define a containing seat adapted to receive the product, the lateral wall being delimited by a free edge opposite with respect to the base and defining an opening of the tray, the lateral wall comprising at least one movable portion configurable between: - at least one first stable position wherein the movable portion is placed in continuity with respect the lateral wall, and - at least one second stable position wherein said movable portion protrudes from the lateral wall and defines an access passing through the lateral wall itself; wherein the lateral wall comprises one or more of: - an angular portion exhibiting a concavity facing the containing seat of the tray, - a curved portion exhibiting a concavity facing the containing seat of the tray, said movable portion being defined at the angular portion and/or the curved portion; wherein the access is delimited by at least one free edge of the movable portion and by at least one intermediate edge of the lateral wall, and wherein the lateral wall comprises, at said angular portion and/or curved portion, at least one cut or one weakening line configured for promoting the formation, in the second stable position of the movable portion, of the free edge of the movable portion and of the intermediate edge of the lateral wall; - a base, - a lateral wall transversally emerging from the base to define a containing seat adapted to receive the product, the lateral wall being delimited by a free edge opposite with respect to the base and defining an opening of the tray, the lateral wall comprising at least one movable portion configurable between: - at least one first stable position wherein the movable portion is placed in continuity with respect the lateral wall, and - at least one second stable position wherein said movable portion protrudes from the lateral wall and defines an access passing through the lateral wall itself; - an angular portion exhibiting a concavity facing the containing seat of the tray, - a curved portion exhibiting a concavity facing the containing seat of the tray, at least one product, optionally of a food-type, received in the containing seat of the tray, at least one plastic film having a first portion preferably in contact with the product, and a second portion fluid-tightly engaged with an internal surface of the lateral wall of the tray not in contact with said product, said film cooperatively with said tray defining a fluid-tight closed volume, inside which said product is housed.