I cannot undo the laces. They are too tough for me. They might aswell be made out of iron.”“I can bend iron,” said Thor, and he leapt to the top of the provision bagand began to tug on the laces.“Well?” asked Loki.Thor grunted and hauled, hauled and grunted. Then he shrugged. “I don’t  think  we’ll  be  having dinner  tonight,” he  said.  “Not  unless this damnable giant undoes the laces on his bag for us.”

Thor’s Journey to the Land of the Giants