I've been trying to find a link since yesterday for the packable raincoat I use, but the online company I purchased from last year seems to no longer be in business. However, I have seen these raincoats recently at Nordstrom's. Looking at mine now, the only brand information I can find is "MPM" as the coat is reversible and does not have any labels. The collar doubles as a generous hood, and this coat kept me quite dry during the periodic downpours we encountered while walking around the gardens at Versailles. When the sun comes out, it stows away nicely in the small shoulder pouch.
Edited to add: Thanks to Nancy in comments who identified the brand as Mycra Pac, I was able to locate online retailers. Here's one. And another.