Firstly, veg tan leather is more environmentally sustainable than chrome tanning. The chrome tanning process results in solid and liquid wastes that contain leftover chromium which is toxic to the artisans tanning the leather and toxic to the surrounding environment.
Secondly, vegetable tanning results in a leather with more body and character that tends to age better and to develop a rich patina over time. It has that classic leather smell free from chemical contaminants.
In short, vegetable tanned leather is a more environmentally sustainable and just all around better suited for our heritage-quality bags.