5 Gallon Elastic Opening Strainer Bags 30 Pieces 5 Gallon Strainer Bags with Elastic Opening. Many uses in filteration needs Durable Nylon Mesh with Elastic Opening. Easy Fit into 5 Gallon Paint Buckets. This strainer is about 120 Mesh and Micorn, Filtrate Particle form the paint to prevent clog when spray painting.