Large:
Front and back: 21cm square
Base and sides: 11cm x 21cm
Medium:
Front and back: 18.5cm square
Base and sides: 11cm x 18.5cm
Small:
Front and back: 16cm square
Base and sides: 11cm x 16cm
5mm seam allowance used throughout.
To estimate the size of the finished project, measure the width and length of your laptop and add 7cm to each measurement. For example, if your laptop measures 25.5cm x 35.5cm, then the finished case will be 32.5cm x 42.5cm. Finally, add 15.5cm for the closure.
