You can have this acrylic pattern here:
The finished size is: 15.7" x 11.8" x 4.3" (40cm x 30cm x 11cm).
Leather: 2.0mm (5oz) leather for surface, size 90cm x 95cm.
1.0mm(2.5oz) leather for lining, size 40cm x 21cm.
Hardware: 20mm saddle buckle x2, 25mm bar buckle x2, 8mm x 6mm rivet x20, 9mm x 4mm Chicago screw x6, 17mm No.5 zipper x1, No.5 slider x1.
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: Let Me Show You How to Make Zipper.
Step 2: Cut All Leather Pieces Use Acrylic Pattern. the Surface and Strap Uses 2.0mm Leather, the Inner Pocket Uses 1.0mm Leather.
Step 3: Now We Make Main Body, You Can Finish Some Small Things at First.
Step 4: Thin 4 Edges of Bottom Piece and Bottom Strengthen Pieces.
Step 5: Paint Glue on 2 Edges, and Fold to Flesh Side.
Step 6: After Folding Edges, the Bottom Pieces Will Be Better Looking.
Step 7: Sew Bottom Strengthen Leather on Bottom Leather As Picture Shows.
Step 8: Sew One Folded Edge of Side Outside Pocket Leather.
Step 9: And Then Sew Bottom, Side Outside Pocket, and Side Leather Together. Look at the Picture Carefully. You Should Do the Same Steps on the Other Side.
Step 10: Of Course, You Should Thin 4 Edges of Back Leather and Fold the Top Edge, We Prepare to Sew Back Leather With the Side and Bottom Combination.
Don't forge sew taps on.