In a light rain, I will trust the weatherproofing of my cameras/lenses. However in heavy and extended rain, such as during my trip to the Kenai Peninsula of Alaska when it rained heavily for 10-daysIMAGE LINK: https://photos.smugmug.com …ith%20salmon.jpg&lb=1&s=A on Smugmug
I used a Kata Cover which did an excellent job in protecting my gear.
BTW: I keep an Optech Rainsleeve for each camera that I use in a back pocket of my camera vest. That is not only to protect my gear from rain but, from salt spray when I am around the ocean and blowing sand when I am i the desert. The Rainsleeves are dirt cheap and weigh next to nothing.