While looking for yarn at Jo-Ann Fabrics the other day, I found a nice little knitting caddy thingy from
ArtBin. (No, this is NOT a blogvertisement). It has a pouch for straight needles and another with pockets for circular needles and accessories.
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The pouches attach to the top crossbars on either side of the caddy.
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Or, they can both be attached to one side.
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The inside isn't huge, but it will hold a few skeins of yarn and a few projects (depending on their size).
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But, something I didn't notice until I got it home is the pouches have strings attached so they can be rolled and used for traveling.