They can live for a long time in those small bags, as long as they were properly fasted before shipping so that water pollution remains at a minimum. As a matter of fact, that bag looks larger than the ones I use, and has more water in it. I've heard tales of people who had fish lost in the mail for a week or more and they arrived safely, if a little worse for wear. The longest one that I've heard about was three weeks. No joking! These are tough little guys and most of them sleep the time away, soothed by the darkness in the shipping box.