This Greenaid Reusable bag By lovegrove & repucci is amazing. Its a reusable shopping bag which is made of a neoprene outer shell and reusable polyester within.
*HIGHLY RECOMMEND* I have one. I love it! It kicks around in the bottom of my handbag, and is always there at the ready when I need it. I never get plastic bags at the shops now. It is wonderful.. it unzips into a really big shopping bag, and is really easy to push back into it's little 'bomb' once I have finished with it. EVERYONE should have one!!