The bag is not heavy, very stable and well finished. It was through our 14j. Daughter subjected to an endurance test, as it uses them as schoolbag since 7 months. At first I thought very long, the do not look good because the kids treat bags rarely care, more surprised I am that the opposite is the case. The material polyurethane is really hardly kaputtzukriegen and still looks good and barely scuffed. It fit so far into all school supplies incl. The heavy books and still leave room for water and food. She has survived on the bike downpours and school supplies were still dry. My daughter loves this bag and I can fully recommend buying!