有两本书需要邮寄 (约两磅)，从东岸到西岸。
想请问一下各位板油，media mail是不是不能网上自己印label和自己投进drop box。
而是必须要到邮局办理的呢？
因为网上没找到checkout，faner显示
For security reasons, all mail paid with postage stamps weighing over 13
ounces must be presented to an employee at a Post Office retail service
counter. Senders are not allowed to deposit this mail in collection boxes or
other unattended locations.
谢谢啦
