I had been thinking about this recently, for the same reason an the author in the link above — plastic tends to get stained, which grosses me out, and makes me want to throw it away. Glass seems so sturdy and permanent; you’re never going to chuck it because it’s crusty. Also, microwaving plastic freaks me out.
Also, stuff with lids can be stacked. I’m now one of those people who has actual food in her fridge, so my single layer system may be on its last legs. :)
