I highly recommend yamatomichi in Japan [ https://www.yamatomichi.com/ ]. Site very informative - English / Japanese - for all aspects on going ultralight. Direct to customer sales - again very well done. I'm used to Patagonia - large sizing for tops is perfect - yamatomichi sizes large a bit smaller so I go for xlarge and it works. For bottoms large is fine.

3 weeks in Nepal with their mini backpack at 30L and again it worked. Internally packed using exped fold dry bags [ waterproof ]. Poles from the UK company - Trail Blaze Mountain King - ultralight carbon fibre. Waterfilter Grayl titanium.

Vivo barefoot for shoes.

Hope this helps :-)