Regarding what #2 said about "Honestly, Japan is amazing but the humidity can..."

• I've found dust to be the real enemy over there. Years of travel taught me that spots always show up at the worst times. I once spent an entire Kyoto trip cloning out sensor dust cuz I forgot a blower.
• Giottos Rocket Air Blaster Large
• Peak Design Slide Lite Camera Strap Black Ditch the grip. A good strap makes the X-T5 feel weightless during those long walks through Tokyo.

TL;DR: Skip the grip. Buy a PD power bank instead of multiple OEM batteries to save cash. In my experience, the extra bulk of a grip isnt worth it for travel. Just charge via USB-C using a Anker 525 Power Bank 20K 20W PD during breaks; its way cheaper than buying extra Fuji packs. Also, for storage, the Kingston Canvas Go Plus 128GB SDXC UHS-I V30 is a great budget pick that handles 4K just fine.

Honestly, Japan is amazing but the humidity can be a real pain for gear. I spent way too much on a fancy thumb grip recently and it just felt loose after a week... total disappointment. I think someone told me that the X-T5 sensor is super sensitive to dust too, so maybe grab a decent blower? Not 100% sure if that's actually true or just internet talk, but I always carry one just in case since I'm paranoid about spots on my photos. Regarding the batteries, yeah, the official ones are ridiculously expensive. I tried some cheap third-party ones and they bloated slightly which scared the life out of me... definitely not as reliable as I expected. I'd almost suggest just getting a glass screen protector before you go because those X-T5 screens seem to scratch way easier than they should, tbh. It’s kinda stressful trying to keep everything mint while traveling, ngl.