You can have this acrylic pattern from here:
The finished size is about: 13.8" x 11.8" x 3.1" (35cm x 30cm x 8cm).
Hardware: 8mm x6mm rivet x8, 201 snap x1.
Leather: We advice 2.0mm (5oz) leather, size 91cm x 53cm.
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: Make the Handle First, Punch Stitching Holes, Glue the Yellow Piece on Handle.
Step 2: Sew Them Together.
Step 3: Fold Top Edge and Sew Tabs One. Do It on Both Front and Back Main Body Leather.
Step 4: Use Sand Stick to Rough the Handle Installation Area, Then When We Paint Glue, They Will Jointed Together Firmly.
Step 5: Paint Glue On.
Step 6: Glue Handle On.
Step 7: Paint Glue on Middle Section of the Handle (between Rivet Holes)
Step 8: Fold and Glue.
Step 9: Sew Handle Wrap Leather On.
Step 10: Now We Sew Front and Back Leather With Bottom.
Step 11: Put Flesh Side Out, Here I Show You That We Will Sew Like Picture Shows.
Step 12: Now Go on Sewing. Sew the Bottom Corner and Side Stitching Hole.
Step 13: After Sewing One Side, You Can See It Will Be Like This.
Step 14: Sew Both Sides, and Shoot Rivets on to Finished This Bag.
Option: You can add a kit of 201 snap on the middle top to close the bag easily.