Some English man bought 2coffees.
I askedhim,｢ do you need a pack?｣
He said,｢ no no pack.｣
A minutes later,my co-worker said to me ｢that was not a pack, but a bag wasn't you?｣
I said to her.
｢I always use "a pack "･･･｣
Although I was thinking of that thing later,I didn't know whether "a pack or a bag "at last.
Which do you use?