T-shirts that are stained, have rips or holes` or are faded or misshapen cannot be donated to op-shops. Choose a t-shirt that can’t be donated and turn it into a reusable shopping bag instead.
Enjoy using your bag knowing that, not only are you avoiding using a bag made from virgin materials, you also saved a t-shirt from landfill. You get extra eco-bonus points if you use your t-shirt sleeves for cleaning rags.