be filled under ambient pressure leaving a gas filled head space in the gable when folding the gable into a flat position the pressure inside the inner container increases such that the requirements of the present invention are fulfilled packaging assemblies comprising such flat folded gable top inner containers are particularly desirable since upon folding up the gable top by the end user the inside pressure of the inner container is released within the container itself avoiding any possible danger of spilling fluid due to the overpressured inner container upon opening in the following example the improved stackability of packaging assemblies according to the present invention is demonstrated inner containers having a gable top design similar to that of fig2 which can be folded down to form a flat top are available from elopak u2122 lierstranda norway under the designation universal gable top u2122 they have a gable top flap height above the plane of the top of the container of about 5 mm before being tightly packed into the outer case the inner containers are made of a paper or cardboard laminate with polyethylene outer layers and possibly an additional barrier layer the inner containers are filled with an uncompressable liquid detergent which occupies about 85 of the volume of the inner container the gas volume of 15 is filled with air eight of these inner containers are packed into an outer case of corrugated cardboard b flute or e flute widely available for example from seiffert gmbh reichenbach germany to form a packaging assembly according to the invention the measured inside pressure above ambient.