I dont mean the more sturdy ones can you pay 5-6p for when you use a checkout that has a human operator who smiles and is polite. But the self service bags are rubbish.Sometimes when there's a big cue and it takes me ages to even open the bag so I can start scanning things through, I start to get anxious and feel myself blushing- sometimes, on bad days, I worry that the people still queuing must be giving me dagger eyes. Its been going on for years but supermarkets still haven't fixed this. Why?