These microlined replacement vacuum bags are used for most of Kenmore's late-model canister vacuums including Kenmore Progressive series using bag styles 5055, 50558 (style C).  If you are using the filtrete version of this bag it is often referred to as Style Q vacuum bag.  

They will also fit all late model Panasonic vacuums using style C-5 vacuum bags.

These vacuums will all have their hose attach to the vacuum on its top cover.