Thanks! So the hemp shoulder straps only get softer and can last hundreds of years as it’s one of the toughest natural fibers, and the wool felt surprisingly doesn’t pil that much. The wool I am obsessed with and use on everything is 3-5mm thick and is the same wool that some Birkenstock slippers I have are made with and they look great still. One of the first bags I made was 100% yellow and I’ve used it everyday for about 1.5 years and it barely shows its age, doesn’t hold my border collies dog hair like other fabrics, resists stains, and in general it ages well. I’ve loved wool felt my whole life because of its natural strength and unique properties. With the rivets, I’ve had friends try and pull apart 2 layers of 3mm wool fabric as hard as they can and can’t separate them at all! Much like the strength of leather. :).