Usually when I need to carry my laptop around, I just throw it in a huge bag with the rest of my crazy bag lady shit. But the other day I ended up with a laptop coated in a mixture of tobacco and yogurt, which had formed some sort of fucking awful paste. Enough was enough. For this you'll just need some leather (amount would depend on how big your laptop is), a button, thread a sewing machine.
I used my laptop as a guide to make an envelope type pattern so simple even a fucking moron could manage it. Width of fabric - 2x width of laptop + 5cm + flap. Length of fabric - 1x length of laptop + 5cm
So then obviously you cut it and you can start to pin it.
I kept my pins super close to the edges because I was paranoid that they would leave holes in the leather because I'm a fucking pussy who couldn't be arsed to cut out fabric again if I cocked it up.
I was super lazy (are you sensing a theme here?) and couldn't be bothered to change the thread in my machine from white to black. This is something I ALWAYS do and it's something I ALWAYS regret. The moral of the story? Don't be a lazy asshole like me; you'll make nicer shit. So anyway, you just sew up the sides and trim off the excess. It's leather so you can get super close to the stitching without having to worry about fraying.
Here it is turned the right side out. Now is a good time to check you haven't ballsed it up before you get on to the fiddly annoying part of this DIY.
Make sure the damn laptop fits inside, or you'll feel like a royal prick later.
Now is a good time for a trim. I didn't bother hemming the edges of my flap because: laziness. I mean, you could if you were feeling fancypants but it would be pretty redundant.
So now we come to the bane of my fucking existence: buttonholes. I placed my button on the point of the flap to use as a guide for measuring how big the hole should be. You can maybe just about see the white tailors chalk below.
See, I fucking suck at making buttonholes. When you've made your hole you can fold it the sleeve with the laptop inside to measure and mark where you need to sew your button.
And that's pretty much it.
Done!