Here is a problem nature and wildlife photographers have to deal with. How to protect gear when accesing the bag. Some shoots involve dust, rain, mud and other elements that may “interact” with your $11,000 600mm f/4 lens. And you wouldn’t want that.
Mindshift Gear’s (re)newed version of Moose Peterson’s “ears” bag suggests a solution to this problem. Here is the premise, while some environmental interaction is unavoidable, the bag tries to reduce them to a minimum. When you open a compartment to get gear out (or put gear in) the flap will automatically close and seal itself so the gear and bag interior stays safe. You still need to close the zipper though.