I'm getting close to finishing this pattern, so I wanted to post some tips for resizing it. I will link to this post in the pattern document so I need to post it before finishing the pattern.
The laptop sleeve pattern comes in one size--13". This is the size of my laptop and it is the only size I could fit within the confines of 8.5" x 11" paper (and I just barely squeaked by!).
This size is going to fit most 13" laptops, but there are size variations in different brands/models of laptops, so make sure to check your measurements against the finished measurements of the sleeve.
To quickly find your measurements, google your brand/model laptop with the word "specs".
The construction of the sleeve is very simple and it should be easy to change the size. If you are varying the size, you might want to do a practice run with some inexpensive fabric and make sure it fits your laptop.
Both the front and back pieces need to be taped together to make the complete pieces, so between the tape markings is a great place to add or decrease depth. Make your measurement change to both A & B pieces.
Both pieces are also half pieces, so to change width add or decrease along the flat "cut on fold" edge. Remember to divide your change in width by 2 since they are half pieces.
Changing the height is slightly trickier, but it can be done by enlarging/decreasing the dart.
Draw your new dart inside or outside the given dart marking. If you change the dart a lot (say 0.5"+), you will need to measure your incremental change on both sides of the dart and add that up. Then you can add/subtract that amount from the "place on fold" edge of the front pattern piece.
The pieces are actually pretty forgiving, so if the dart change is slight you probably don't need to make changes to the width at the place on fold edge.