And that's how easy it is:
1. Print out templates for the covers and have them enlarged to DIN A3 in the copy shop or transfer the measurements directly onto the fabric.
2. Inner shell: transfer template to the fabric. Cut out the fabric. Flip the envelope inwards and lightly pin.
3. Lay the piece so that the coated side of the bottom and the outside are on top. Then lay both open edges together and sew with approx. 1 cm seam, so that a hose is created. Then invert it so that the seam lies inside.
4. Transfer the stencil of the outer shell to the fabric, place the same stencil again on the dashed line so that they receive the complete width (42.5 cm) of the shell. Cut out the fabric.
5. Flip the envelope inward and lightly pin.
6. Lay the piece down so that the uncoated side of the bottom and the envelope are on top. Then lay both open edges together and sew with approx. 1 cm seam, so that a hose is created.
7. Place the sewn inner cover in the middle of the newly sewn hose (floors are on top of each other, seams look in the same direction) and fix with pins.
8. The sewing machine is now sewn at a distance of approx. 0.5-1 cm over the entire bottom side, so that the bottoms of both casings are closed and these are also connected to each other.
9. Slide cooling elements between the fabric layers.