actually you are completely wrong on this issue

the first class mail, weight can not exceed 13 oz,
Size limits:
- No more than 108 inches in combined length and girth

Which means, you can not mail heavy ( more than 13oz) and thick item using First Class Mail

所有跟帖： 

• 问题找麻烦的邮局营业员不是找重里的茬，是找邮件体积的荐。 -小小爱茉莉- ♀ (0 bytes) () 11/13/2009 postreply 14:13:55

• you are wrong, if邮件体积is big, you need to use priority mail -远唯一- ♂ (158 bytes) () 11/13/2009 postreply 14:19:14

• 此规定找到了，我很早以前看过 -小小爱茉莉- ♀ (288 bytes) () 11/13/2009 postreply 14:23:19