The Fjallraven Rucksack No. 21 Large is the largest backpack in the No.21 series. For when you want to carry more stuff, because the Mini is most definitely way too small. The 30L size is enough to hang onto a full load of books for school or head to work with your laptop in the padded bottomed sleeve. Or ditch the books and fill with just enough gear for a picnic with friends out at your favorite park. Day hiking, city exploring, and just plain having fun, this durable backpack can do it all.