I sent Susan Terpin an email. Here is her response:

"Hi Peggi,

Yes I designed the Zip Zip Bag for Connecting Threads. The pattern actually belongs to Connecting Threads, so I cannot sell it to you. However if you want to apply some pressure, contact Teri Stillwell at Connecting Threads, maybe she will release the pattern as a download!

I'm sorry I'm not much help in this case. I do have plans to write a 7" tablet and an ipad bag design for Sewing Sue, but it is just in development now. If you have any suggestions or requests, maybe I can work them into a design.

Cheers Sewing Sue"

Here is a web sight that might be what you are looking for. http://tipnut.com/messenger-bags/

There is a bag that sounds a lot like the one that you are looking for on "sew sweetness.com" called the Dot,Dot,Dash bag. It is a downloadable pattern for about $9.00. I also saw a similar one for free on "sew4home.com. Look in the project guide for bags and totes. It had 3 zippers if I am not mistaken. There are lots of different projects on that site. I have made several and was really pleased with most of them. Good luck finding what you want.

Grandma, Please let me know if you have any luck finding this pattern. It doesn't sound like CT is going to offer it again. So sad!!