There I will show, how I sew the purse with only 3 seams.

First I must say, the idea coms from a german site "Faulengraben".
1: Make the pattern as shown in the 1. pic one for lining one for outer fabricin every size you want.
2. sew lining and outside right sites together with 1. seam (pic2)
3. Fold the 1. seam to the flapline and the lining exactly over it (pic 3 and 4)
4. Fold the bottom of lining and outer fabric as shown in pic 5
5. Sew seams 2 and 3 (pic 6)
6. Turn inside out and sew the opening by hand.
You can sew around the flap by maschine also.
Thats all .
Sorry, but my english is bad, I hope you can understand all.
If there are questions, you can ask me.