Not really, but if you are planning on returning to the US shortly before the expiration of your current H-1B approval notice, it is a good idea to have a new approval notice or at least receipt notice with you, to indicate that you are still needing to return to the US to continue your employment in H-1B status. Some people have had issues when traveling without this supporting documentation and attempting to enter the US a few weeks to a month before their current H-1B expires.