Purse Pattern

I went to my local Goodwill store and found a marvelous purse/pocketbook/handbag. It is homemade of denim material (blue background, white stars) and has two straps. When the purse is "unfolded" it looks like a duffel bag, although not as big. The straps are on each end of the duffel bag, with a zipper running between them. The outside and inside pockets are just underneath the straps. To fold the purse, the straps come together and are joined by a piece of velcro. This makes it easier to carry and it looks like a regular purse. I love it and want to make one in a different fabric. Would anyone be familiar with a purse pattern like this? I tried Carol's Carryalls but hers is different; doesn't have the zipper in the middle and that's the biggest plus for me.