When they first hatch they do usually have a sack attached to them but it usually sticks to the egg and falls off as they pop out or falls off a little while after they get out. It should have fallen off by now, are you sure it has been hatched for a few hours? It looks like it just came out a few minutes ago. He looks very wet, if he was out for a few hours he should be at least be somewhat, if not completely, dry and fuzzy.