H1B gets extended while current H1B is still valid

This might be a very stupic question, but to be one the safe side, I'm still asking:

My current H1B will expire on Sep 15 2014, my employer just got it renewed with premium process, so the new H1B says valid from Sep 16 2014 to Sep 15 2017. I plan to travel to Canada and come back before Sep 15 2014, (I'm Canadian citizen). Which H1B package should I use ? The one expired on Sep 15 2014, right ? Many thanks 

所有跟帖： 

• 最好避免9/15之前出國旅行.如果一定要去,帶上新的和舊的H-1B批準通知I-797.入境時要求邊檢官員蓋入境圖章有效期至201 -python2012- ♂ (128 bytes) () 08/11/2014 postreply 09:31:48

• what if I don't even get a stamp ? -ZhangSan1234- ♀ (838 bytes) () 08/12/2014 postreply 06:45:36

• You added a complication by traveling to Canada before 9/16/2014 -python2012- ♂ (329 bytes) () 08/12/2014 postreply 09:37:42