Nipped into Tesco in my break today for a few bits and pieces. When I reached the checkout I realised that I didn't have a bag in my handbag. The checkout girl told me that they had run out of carrier bags and I would need to pay 99p for a bag for life. I asked if they had any on another checkout and was told that they hadn't. As I was leaving I could see people walking out with normal Tesco bags but had no time to do anything about it.
I normally always take my own bags and have no need for another bag for life. Would it be unreasonable and petty to complain or take it back for a refund?