Abstract: A breather assembly for a sealed container such as a bedside drainage bag, such bag being made of sheets of polyvinyl chloride plastic which material has the characteristics of receiving an electronic weld. A breather element is positioned between one face of the container wall and a retaining ring. The wall and ring have openings therein positioned in alignment with each other. The breather element retaining ring is comprised of a non-porous flexible material such as polyvinyl chloride having the characteristics of receiving an electronic weld. The breather element is made from a material comprised of a woven nylon substrate with a coating of a copolymer of polyvinyl chloride and acrylonitrile which material is effective to allow free passage of air therethrough while at the same time effectively resisting the flow of liquid therethrough. Such material also has the characteristics of receiving an electronic weld.