Package of flexible material, particularly for sterilisable food products

Container (1) of flexible material, particularly for sterilisable foodstuffs, consisting in a parallelepiped box having, in the position of use, a base or wall (2) bottom, a wall (3) above, a wall (4) front, a rear wall (5) and two walls (6, 7) side, being provided an opening (8) closed by a patch (9) peelable on one of said walls, characterized in that said patch (9) is heat sealed peelable manner in said container wall along a guide (20) is disposed sealing both sides of the peripheral edge of said opening (8).