actually you are completely wrong on this issue

来源: 于 2009-11-13 14:09:23 [旧帖] [给我悄悄话] 本文已被阅读：次

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