Cut and paste from mass webpage on mass gun ownership laws.So cable locking the action and placing in a nylon bag isn't kosher?
"Large-Capacity Rifles and Shotguns: All persons transporting large capacity rifles or shotguns under an LTC must transport them unloaded and in a locked case, locked trunk, or other secure container"
As far as what constitutes a "secure container".......per most mass gun laws it's vague. Most consider a luggage lock between the zippers to be sufficient for large cap long guns.