haha I know there are so many decisions. I feel as though a chameleon might work better for me and what I would need though...who knows!
I have one of each size (the Chameleon), but only use the small and large. I use the small daily and when I use my bigger "bottomless pit" bags, I drop the small into the large. Fits with room to spare, adds extra pockets and keeps everything upright. I don't like the medium -- it's too tall/deep for my taste.
hovercraftier- thank you so much for trying out your chameleon in the Louvre for me! I really, really appreciate. Especially, seeing as Kathy, the owner of Chameleon suggested a large. She said that the large would be a better use of the space in my bag. But I was so concerned that it would be really, really too wide. I don't know..... she did say that you can take out the side structure (or cut it to fit) really easily so that the thing will scrunch to fit. Decisions, decisions........