Always have fruit and vegetable bags in your handbag
Unfortunately, sometimes I forget my mesh bags for fruits and vegetables when I go shopping. Then of course I take the bags in the shop at the counter.
To still avoid plastic waste - I had once bought a small box of mini chocolate candy - this box has a size of about 4.0 cm wide / 8.5 high / 2.0 deep and fit it 7 bags , Perfect for the handbag and I always have it with you. Even if I buy spontaneously.