I have also commandeered DH's desk! Naturally there are no photos showing the process, just the finished item, I do simple - no pattern, stitch as you go and then find easier ways! Eldest daughter always asked for "the second one you made, it's better!"
So here we are - I shall make a sleeping bag insert out of the white sheet, which is a necessity and no problem.

I added two side pieces and stitched them onto one side only. I then inserted the foam and handstitched the sides so that the bag became an envelope.
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Laptop just fits nicely |

After pinning 'the belt' into place I stitched each strap on both edges in one continuous stitching.


This is how they look when I carry them around, I link the smaller bag handle over the main bag handles.
Bright, cheerful, strong, convenient.
A good day's work, methinks