comments:
Zook25 posted on r/rx1004w
https://www.amazon.com/dp/B008IAMEV2?ref=ppx_yo2ov_dt_b_fed_asin_title Not totally rigid (not hard plastic), but good enough. RX100 fits very well, but leaves little/no room for spare batteries, at least not with their plastic cases. But I'd buy it again.