I've been buying lenses (almost all used) since I started in 4x5 more than 20 years ago.
My full kit for the monorail ranges from 72 mm to 600 mm (both extremes require changing bellows and/or rail length).
These are carried about on a cart in a collection of cheap Office Depot "catalog cases" which are a perfect fit for the boards with lens wraps around the mounted lenses (lenses mounted on 6" square Cambo boards).
My minimal backpackable kit (lightest weight using a carbon-body Toyo field camera) is a Fujinon 150 mm and a Caltar 210 mm, which work for almost everything except high-rise architecture. The Toyo can be folded up with small lenses such as the Fujinon still mounted.