Question: Does a regular arca swiss plate fit in this backpack clip?
Answer: Most Arca-Type compatible plates will fit the Falcam F38 Quick Release System for Shoulder Straps.
Question: Can this work on the Ronin S Gimbal ?
Answer: The Ronin S gimbal has 1/4" and 3/8" mounting threads, so it could be mounted using the Falcam F38 Quick Release System for Shoulder Straps, although it may not be a good idea because of the physical shape of the Ronin S.