The OSMO handheld camera system is quite compact, despite adding the Z-Mount, external microphone and a sun cover for the monitor. We used this set-up for this video which was recorded on a stinking hot summer day at our local beach.
There is still a little wobble when walking, but its pretty manageable. We recorded in 2k cinema mode (the 4k bit rate is too slow) using manual settings and a variable ND filter. We mastered to HD, after adjusting the colour.