Vacuum cleaner dust bag
FIG. 1 is a perspective view of a vacuum cleaner dust bag showing my new design; 
     FIG. 2 is a front elevation view thereof, and 
     FIG. 3 is a side elevation view thereof. 
     The rear side of the dust bag is substantially planar and unornamented. 
     The characteristic feature of my design resides in the specific appearance of the reinforcing collar, as best shown in FIGS. 1 and 2.