Flexxxible! This rucksack gets wider and wider when children fill it with books, games and any number of other things. The adjustable straps offers stability. When shoulder straps are tucked away Elasto turns into a carry bag. Tough as a bear Teddy holds on to the rucksack with his Velcro type paws. In his tummy he hides a small zipped pocket. Safety reflectiors attached.