Backpack been showing in lots of designer's bags, some of them are really nice and made me want to have one :p

Soft leather rope handle sack bag by Balenciaga, gold effect ring, buckle, stud and zip details, front zipped pocket and drawstring shoulder straps
size : Height 16in (41cm) width 14.5in (37cm) depth 9in (23cm)
currently retails for $1,624.41
seen at : www.asos.com