Abstract: A breather bag for use in a sealed silo maintains pressure equilibrium between the inside and the outside of the silo by its volumetric change while preventing the ingestion of oxygen laden air. The breather bag is of generally arcuate or semi-circular shape and has a generally circular cross section. The breather bag includes at least one flexible conduit which extends between the breather bag and the silo roof and provides communication between the inside of the breather bag and the atmosphere. The breather bag is comprised of at least three plastic panels which are sealed together along overlapping edges. Two of the panels are a generally semi-circular shape and the third is a generally hour-glass shape. A continuous hanger strap is sealed along the upper arcuate center line of the breather bag to facilitate hanging the bag within a silo.

Abstract: A device for releasably retaining together in air-tight relationship the edges of a plurality of film layers which may be used, for example, in an inflatable structure. The device includes a pair of elongate strips, one of which is snapped into the other with the edges of the film layers positioned therebetween, thereby forming a seam at the film edges. The strips are preferably extruded shapes which are coextensive in length with the edges of the film to be sealed together. Means are provided for anchoring the strips to the ground after they have been engaged with the film layer edges, with the anchor means designed to enhance the locking force placed on the device.