What color backpack should I choose for outdoor travel?

Actually, why are most travel bags black? In fact, the main reason is to prevent stains. It is inevitable to bump into things when traveling, so black can play a very good role in preventing stains. In fact, Black has always been a fashionable color and never goes out of style in any era. If you think black is really unacceptable, you can choose a solid-color and dark bag, but basically you have to look for those outside, gray or sky blue are fine.