I have a beautiful and useful rain jacket that weighs practically nothing and squishes down pack-of-cards small, but that's not coming with me either because it doesn't have a hood. I'm bringing the big yellow thing that has both a hood and an attached pouch that serves as a pocket. I'm pretty sure it will rain and I don't plan to stay indoors. There is no bad weather.
Since I seem to be providing an inventory of my rain stuff I will complete the list with a description of my poncho, which is not coming on vacation either because, although light, it's big enough to cover me and a big backpack. This is not a backpacking vacation.