White Dust Bags?

My Hailey and Hippie (both black leather) came with white satiny dustbags. I've seen brown ones in bags in resale stores so I wonder if the color change is recent, or related to color? Seems like a brown dustbag would be fine for a black bag?
 
My black Madison leather carryall came with a white dustbag. I wouldn't expect any color transfer or anything with the leather, but regardless it came with the white satin bag with brown cord.
 
I was wondering about this the other day. My eggshell embroidered maggie came with a brown dustbag, which seemed really strange. Unfortunately I only have brown dustbags so far, so I can't switch it out. What should I use?
 
When I started in 2005 or so, it was the brown cotton ones with red stitching. Limited edition of certain lines comes with a white cotton one with purple or pink stitching. Not too long after that, I get the white satin or brown satin ones.