I have a non weather sealed DSLR (Canon 2000D) along with a bunch of non weather sealed lenses and other equipment. I am for obvious reasons not planning to use the camera outdoors in rain, snow or similar weather.
However, I may have to move the camera in the bag to another indoors location in rain.
Today, I learned that many "all weather" camera bags have separate raincovers you have to put on. So, it's not the main material that is weather-resistant but rather a separate raincover.
Do typical camera bag materials (apart from the separate raincover) keep the equipment inside dry enough during a 5 minute walk in medium rain? In very heavy rain, I can of course use the separate raincover but I would prefer a camera bag that is built from material that keeps the camera adequately dry in medium rain for short periods of time. I understand that most camera bags are built from nylon and polyester.