Vegetable Tanned Leather - will darken over time with wear. I recommend you oil or wax your vegetable tanned leather bag every 1/2 year. This helps keep your leather hydrated, helping it to last for many years to come. This will also darken the bag slightly too.
Waxed Cotton Canvas - Do not machine wash waxed canvas. Use cold water and cloth/sponge to remove stains on your bag. Never use detergent or soap – as it will wash away the wax finish!
Re-waxing your canvas bag - Over time with lots of use waxed canvas may lose its water resistance. If you want to restore your waxed canvas, simply hand apply Otter Wax then apply heat to allow the wax to impregnate back into the canvas. You can use a hair dryer or let lie in the sun.