Get a cheap, oblong, non-pilot bag that with flap opening that has some degree of water resistance. Cheap because you do not want people to think their might be expensive stuff inside and you won't get too upset when it gets knocked and banged. Oblong bags stand better and there is nothing thing worse than fighting with a bag to get at its contents. As for contents, less is more. Let things earn their place or you'll forever be hauling around an overweight bag of expensive junk.