In my experience, walking around Tokyo all day requires a strap that actually breathes and moves with you. I've tried many over the years and these two are solid alternatives:

• Rock n Roll Straps Classic Black Leather Camera Strap: The link design basically acts like a shock absorber. It distributes weight way better than a thin strip of leather.
• Gordys Camera Straps Leather Neck Strap with Neck Pad: More utilitarian, but that extra pad makes a huge difference if you're out for 8+ hours. The Rock n Roll looks way cooler tho, honestly.

Honestly, I was pretty let down by the Artisan & Artist ACAM-280 Leather Camera Strap. I bought it for a street photography weekend, but unfortunately, it felt like it was sawing into my neck after just a few hours. The leather quality is high but its just too narrow for long days. Rock n Roll straps have the same problem; they look amazing but the comfort is not as good as expected when your M camera starts feeling heavy. Tokyo involves a ton of walking so you really need to be careful. A few quick tips:

• Stick to straps that are at least 20mm or wider to distribute weight.
• Try the ONA The Lima Camera Strap if you want leather with more surface area.
• Skip the thin cord styles entirely for travel. I ended up using a Domke 1-Inch Web Camera Strap instead. It doesnt look as fancy as the A&A but honestly my neck didnt hurt. Dont make the mistake of picking style over comfort for a big trip like that... you'll regret it by day two.

Building on the earlier suggestion, unfortunately many boutique straps are not as good as expected when it comes to long-term comfort. I had issues with the thin designs because they simply dont handle the density of a Leica M well during a full day of shooting. For your Tokyo trip, I would suggest looking at options that prioritize weight distribution over just the minimalist look.

• Vi Vante Matador Black Leather Camera Strap
• Wotancraft Paratrooper Leather Camera Strap The braided design of the Vi Vante provides some natural shock absorption, while the Wotancraft has a much better width for the shoulder. If youre walking all day, youll regret a thin strap by lunch... honestly, comfort is worth more than the brand name here.

Saving this whole thread. So much good info here you guys are awesome.