Hi folks - I designed a basic tool in Excel to help you decide which Brain Cell may be a good fit for you. If the TB mentions your laptop as having a perfect fit with one of their sizes, then you are in luck. Else you can use my tool to help you decide.
In the attached file, enter the dimensions of your laptop in cells B2,C2,D2. Then enter weights as per your needs. If you want the height of the laptop to have a very snug fit in the bag, mention 100% under height, if you don't mind the bag being wider than your laptop mention a value less than 100%, depending on how important it is to you, etc. Finally, if you want a visual aid, choose a Brain Cell size in cell G5.
Hope this tool helps.
Edit: Attachment deleted per bagman's request; see new version in post below