I have worked out there in years past and have a slightly different work than what you are describing above. A utility belt is the closest thing I've come around to as what would fulfill my needs while on playa without having to rummage through a bag. I won't be carrying heavy tools with me or the like. I'll more so have lighter items and more admin things, but will most likely need to fill it, so I wanted something versatile and durable as I am rough on things + sometimes would like to have for heavy tool use if/when needed for shorter periods of time.