If you're anything like me, whenever you go grocery shopping, you end up leaving the store with several of the flimsy plastic bags. Many of the more eco-minded places have started encouraging people to bring in their own bags, and even sell re-usable bags at the store (most with a huge logo on it). Even after I buy one of these bags, I only get to use it a handful of times before I start forgetting to return it to the car, and while I don't mind advertising where I shop, there's something that feels vaguely wrong about shopping at Trader Joe's or the local Farmer's Market with a re-usable green grocery bag from Whole Foods.
Earlier this month, I purchased two Flip and Tumble bags, which are nylon bags that are easily tucked into a ball shape. This makes them a cinch to throw into a purse or a bag. The material is extremely durable, and can carry up to 20 pounds worth of stuff.
Look cool. I'll have to check them out next time I'm out your way.
If you need any more, you might check these out: http://www.kk.org/cooltools/archives/002577.php