This is the outer cloth zipper bag for the Eureka Sanitaire (Blue / Professional line) that uses style F&G disposable paper bag. This genuine Sanitaire outer bag is Blue in color, and has the two screws at the bottom of the outer bag that fit into the base housing..

For use with Sanitaire models: S634A, A-1, A-2, B, S647A, A-1, B, D S639A, S644B, S645A, S648B/D, S650A, S652A, S654A/B, S655A,S657A, S658A, S659A, S660A, S661A/B/E, S662A, S663A, S678A

This outer bag will also fit all Eureka 1900 and 200 series models.