The TriLens was launched nearly four years ago. It is a belt-mounted rotating lens holder for three lenses, and is now
available for K-mount. The similar two-lens
Peak Design Lens Kit is still not available for Pentax.
The TriLens seems to be aimed at wedding and event photographers. I'm not sure I'd be wanting to risk it on a bush walk through difficult terrain. When it was first flagged on
PF by Fl_Gulfer in 2017, the reaction was overwhelmingly negative, and it was even predicted they'd be out of business in six months. Well, they're still going strong it seems.
The Think Tank Modular Belt System seems a more secure option to me, affording protection to the lenses, not suspending them from their mounts and distributing the weight better around the waist. But the TriLens is rather compact and may be very workable for small and medium primes at an event if using only one camera.
So I'm wondering if anyone has actually used the TriLens. I can see advantages and disadvantages in theory, but practice may be different.