You can have this acrylic pattern from
The finished size is: 13.2" x 5.1" x 2.2" (33.5cm*13cm*5.5cm).
Leather: We advice 2.0mm (5oz) leather, size 30cm x78cm.
Hardware: 831snap x2, No.3 zipper 34cm x2, No.3 slider x2.
Tools: If you are a new leather player, try to considerate to have tool kit here: http://www.leathercraftpattern.com/leather-tools-leathercraft-tools/leather-tool-kit/leathercraft-tools-leather-craft-patterns-leather-art-leather-carving-tool
Step 1: Punch Holes on and Sew Zipper on Gusset.
Here I add some pictures to show you how to make a zipper.
Step 2: Sew Zipper on 2 Pieces of Main Body Leather, You Can Punch Chisel Holes Firstly on Main Body Leather.
Step 3: Cut Other Leather Pieces and Punch Chisel Holes As Pattern Shows, Ready for Work.
Thin the edges will be easier for sewing, and your leather works will be more beautiful.
Step 4: Sew Flap on Front Pocket Leather.
Step 5: Sew Front Pocket Outside Piece on and Then Fold Welt, Glue It on As Picture Shows.
Step 6: Now Glue Gusset on Welt and Sew Them Together.
Let's reverse it to see the effect after stitching 10cm, nice.
Step 7: Finish Sewing.
Step 8: Reverse the Inner Outside.
Step 9: Now We Sew Back Piece On, and Then Shoot Snaps On, Please Look at the Pictures.
Step 10: Sew Inner Pouch on Flesh of the Other Back Piece. and Then Sew 2 Pieces of Back Piece Together, Don't Forget Sew Should Strap On.
Then the bag is finished.