I bought this specific imported jam and it's air-tight. Most of the time, I had to ask my husband to open the cover for me. So far it was in good condition. But this time it was not so.
Since my husband was not around at that time when I wanted to open that bottle of jam, I asked my guy staff to open the cover for me. He took some time to open it. I just tighten it a bit and left it in my bag.
The next morning, when I wanted to eat bread with the jam, I opened the cover. To my surprise, it has mould on the jam. I thought maybe I could just scrap it away and continue taking it.
But my conscience told me to return it. So I asked my husband if it could be returned. Of course, he said. So Next time when you buy jam, make sure it's in good condition..