Jeni and I got a gift certificate for The Grommet at Christmas. We ordered three items, but I think my favorite is the Packbasket from ADK Packworks (http://www.adkpackworks.com). We use it every time we go to the farmer's market. It is so versatile and sturdy. I think we may need to get a few more. I like using a reusable bag, but I often forget to get them back in the car. This one is the exception -- it always goes right back into the car so it is ready to go.
Our other purchases from The Grommet were a backpack that rolls up to a tiny size and a cool beach blanket from parachute material with pockets to catch the sand and anchor it down.