Bag and Interchangeable Insert

Hi.
Can anyone help me out I am looking for a pattern for a tote/bag which has an insert which you can take out and use in another one. I saw one when surfing various blogs last week (while supposed to be working!) but can't remember where I saw it. All advice gratefully received
Thanks!

Maybe this?

http://www.studiokatdesigns.com/portapockets.htm

Hi Jenny
Thanks for replying. Hmm I'm not too sure wether this is the one or not, I had sort of got lost in blog land when I came across the pattern and all I can remember is it was white & red!
The link you sent looks promising though. Have you made it? Is it difficult? I really enjoy making bags,  but if they are too difficult, I'm afraid I just give up and store (dump) them in the back of the cupboard. Don't ask me how many are lying there patiently waiting to be finished.
I look forward to hearing back from you
Thanks again
Karen

Maybe it was this post on this site!

http://sewmamasew.com/forum/index.php?topic=1048.0

Thats it! Thanks very much - I was beginning to think I had lost my sanity!
Karen