I love this product.  This is the only "handbag" I've used for many, many years.  I use it everyday until it wears out and I buy another.  It is very lightweight, and has a great assortment of pockets -- some with zippers; some without.  Because it (the medium size) is fairly large, I tend to overly stuff it, perhaps mitigating the purpose -- to protect my back -- but because it is so lightweight, I can carry my little books and other items I wish at all times.  It is very durable and weatherproof.