Hmmm…, this cage just came out in Japan recently, but not under Strida brand.
This cage (and bag) are sold under DOM brand. (DOM = Dirty Old Monkey).
I have noticed that once you place your bottle into this cage, you are detaching “bottle + cage” from base which is attached to your bike.
Actually, I don’t have this cage. I mount my bottle on my Strida by using Minoura bottle cage and holder.
[url]Strida Water Bottle Holder... doesn't fit? - #4 by Amuro_Lee]
DOM just reminds me of it.