First you need a bag. For superduper eco ethical credentials you need an organic fairly traded bag. This is a tote I think in the US and a shopping bag in the UK. People Tree
provided the one I used for ÃÂ£5 plus postage. It has a print on one side. The other item you need is a marker pen or fabric pen. I used a Dylon fabric pen in Black which cost about ÃÂ£1.20. (I have no idea about the ethics of Dylon, so don't blame me if they turn out to be supernasties, as there was no choice of make at my local haberdashery "Blacks" on Deansgate, Blackpool, Lancashire).This photo is of the Sainsbury's Anya Hindmarch bag which had people queuing to buy all over the UK & sold out.