Over the years I built a rether complete Olympus/OM system system. I select a combination of bodies and lenses depending on the journey. Here is my arsenal:

Bodies
OM System OM -1  (x2)
OM System OM-3
Olympus TOUGH TG-6 for underwater photography (for snorkeling or diving with the PT-59)
I still own a couple of Olympus EM-1 Mark II as backups.

Zoom Lenses
Panasonic 7-14mm f/4 Lumix G Vario ASPH (old one, don’t use it so much lately, I prefer the 9mm)
Olympus m.Zuiko 8-25mm f/4 PRO (great allrounder, still have not found its ideal use)
Olympus m.Zuiko 12-100mm f/4 IS PRO (my workhorse when I go minimal)
Olympus m.Zuiko 12-45mm f/4 PRO (new addition, when I really want to go lighweight)
Olympus m.Zuiko 40-150mm f/2.8 PRO (mounted on my second body when I am out for safari)
Olympus m.Zuiko 40-150mm f/4 PRO (smaller/lighter alternative to the f/2.8)
Olympus m.Zuiko 150-400mm f/4 PRO (the ultimate wildlife lens)

Prime Lenses
Olympus m.Zuiko 8mm f/1.8 Fisheye PRO (for playing)
Panasonic Leica 9mm DC Summilux f/1.7 ASPH (great for astrophotography)
Olympus m.Zuiko 25mm f/1.2 PRO (my favorite portrait lens, a bit heavy for a prime)
Olympus m.Zuiko 45mm f/1.8 (my second favorite portrait lens when weightmatters)
Olympus m.Zuiko 90mm f/3.5 Macro IS PRO (obviously for macro)
Olympus m.Zuiko 300mm f/4 IS PRO (for BIF and when for the 150-400 id too big and heavy)

Teleconverters
Olympus TC-14 teleconverter
Olympus TC-20 teleconverter

Accessories

Tripods
MeFoto RoadTrip, purple (great looking, lightweight and doubles as a monopod
Manfrotto PIXI EVO Mini Tripod (my favorite when I do not get the MeFoto, which is always. Great for night and astro)

Flashes
Olympus FL600-R (but I rarely use flash)
Olympus FL-LM3 Flash (comes with the OM1 body, always with me, do not use it)
Olympus STF-8 macro flash system (for macro)

Bags, Straps & Other
Wandrd Prvke Lite: My favorite when travelling. 15-20L, with the highest cool factor.
Think Tank Photo Airport Advantage Roller: when going on safari, holds the 150-400 and everything else including the gimbal head)
Straps and Leashes from Peak Design (easy to attach/release, freat quality)
Dual Body Harness: Clever Supply Anchor Camera Harness (for two bodies and compatible with peak design achnors)
Olympus underwater case PT-59 (for diving with the Olympus Tough-6, up to 50m)