[ U ] the number of letters received at one time or on one subject一次发送(或收进)的信件;(有关同一主题的)一批信件
It was clear from our postbag that viewers were unhappy about the programme.从我们收到的来信可以清楚看出,观众们对这个节目不满意。
[ C ] a large strong bag used by the Post Office for transporting and carrying letters and parcels邮袋