Disclosed is packaging for biological material, which comprises two substantially parallel walls connected to each other along a substantial part of their periphery and in a central area of the packaging, the central area, wall area and thickness, and periphery being configured to ensure that the walls have sufficient stiffness to stay parallel after filling, the packaging incorporating at least one opening for filling whereby the packaging may be filled, and the two parallel walls separated by a distance which is equal to or less than 2.5mm.
