Whip one of these out next time you're at the grocery. It fits conveniently in your bag and expands to fit about two plastic bags worth of groceries. An added benefit is that it saves the use of plastic bags and the environment.

Baggu Bag
With all the eco-conscious products coming to the surface, we love alternatives to the plastic grocery bag. The Baggu Bag ($8) makes the perfect reusable bag as each one holds the same amount as 2 or 3 plastic bags. Made from strong rip-stop nylon, the bags come in a variety of colors and fold up easily for keeping in your purse. (via Outblush)

simple, handy - want it!

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Really DOES hold 2 or more plastic bags worth of groceries. Plus, no lost circulation carrying these up a flight of stairs. Oh, and AWESOME colors.

Very compact and easy to store in most purses.

I don't even remember how I found out about Baggu Bags, but I discovered that Endless.com has them, so I added them to my order one day. I get so many questions about these bags! They're huge, sturdy, and very cute. I can fit a week's worth of groceries from the farmer's market in 3 bags. I've also used them at the beach. After I unload them, I fold them up and put them into their little cases and slip them into my purse. Loves! (via Endless.com)

I'm pretty happy with the reusable shopping bags that I already have. However, I like the wider straps on the rip-stop nylon bags. You can also put 2-3 times the amount into one Baggu, that you can put into one ordinary plastic bag. I went to the Baggu website and found that for $5, a pouch that holds up to 10 Baggu shopping bags can be purchased. I like that idea. Fishing around for the bundling up reusable bags in my purse can be a little annoying.