Cut fabric to the measurement in diagram, using Rotary Cutter.

Pin two pieces with right sides together. Mark sewing line with Air Erasable Marker on one side. Mark centre of one of the short side edges. Mark 5cm away from the centre mark. This will be the opening. With right sides together, sew edges all around, leaving an opening. Turn the fabric right side out and press edges with Roll and Press or press with iron.

Cut out Straps in contrast colour fabric. Sew as indicated in diagrams.

Fold in top and bottom edges as indicated in diagram, insert straps in the opening and pin them to the case.

Unfold and sew edges all around on the right side with the straps in place.

Fold in top and bottom edges and sew short side edges once more.

Mark pockets where desired with Air Erasable Marker and sew along each line.