Look what you need in the next step:
Step 1: Supplies / Tools:
- a piece of felt in the colour you want (at least it should have 60x60 cm / 25x25 - it's a proof of concept, feel free to get a larger piece of felt or leather or the fabric you think would fit best your taste for even bigger laptops or your picnic table or anything else), I used a black one, which was a good choice for business purposes, but a bad one for the instructables because of having no contrast
- a scissor
- a ruler
- hook and loop-tape
- a set square
- a dressing marker
- fabric glue (or if you can sew, than sew)
- electric iron
- round cup for smooth edges
Step 2: Mark your pattern
Lay down your Netbook on the fabric, so you can turn over the felt nearly to cover the hole netbook/laptop. I the case you have an eeePC 1000H like me, the upper angles is a good line to align.
Bend the felt and mark the bending with your dressing marker. Turn back the felt and draw a line from mark to mark.
Then draw right-angled lines a bit wider than your laptops width. Look at the picture. To describe this is more difficult to me as a non-native speaker than it will be in real, so don't be confused.
After marking the end of the top baffle (by turning it over with the netbook in the felt) you should have the pattern, shown in the next step.