Step 1: First design the size of fabric small backpack on paper, and cut the fabric according to the design. Cut the prepared floral flannel into two pieces of cloth with the same size, and fix all four edges of the two pieces of cloth.
Step 2: Cut the prepared interlining cotton cloth into the same size as the floral cloth, align the floral cloth with the interlining cotton cloth, fix the sewing edge with a pin, and do the same with another interlining cotton cloth and a rag. Align the two processed composite fabrics face to face and sew the left, right and bottom edges. Remember not to sew up the opening.
Step 3: After the sewn fabric small backpack prototype is turned over, use a ruler to fold a triangle at the bottom of the backpack, fix the position with a pin first, then sew it to the bottom centerline, and do the same for the other corner at the bottom. In this way, the fabric small backpack has a width, which is more convenient to store.
Step 4: Cut the prepared interlining into a size 2cm smaller than the edge of the floral cloth, fix the cloth after sewing, align the two pieces of cloth and sew the left and right bottom edges, and the basic shape of the interlining is completed.
Step 5: After the lining prototype is completed, the bottom edge should be treated like the front fabric of small backpack. The difference is that the folded triangle does not need to be stitched at the center line, but the redundant part is cut off after being stitched with a knife. Keep a certain distance from the seam when cutting.
Step 6: Fix the prepared belt buckle and lining with a pin and sew them together. Use brown flannel as the front cover fabric of the backpack. The length of the long side is the same as that of the backpack, and the short side can be determined according to your own needs. Fix the front cover with a pin and sew the fabric small backpack fabric. Finally, leather buttons can be installed on the front cover and backpack.