I’ve been using Incase neoprene laptop sleeves for the past 3 or 4 years.
I’m not sure why.
I wanted a sleeve that would enable me to recognize it amongst a pile of laptop cases. Just about every sleeve follows the same formula as Incase: form-fitting neoprene and a zipper. One of the few manufacturers making something different is ColcaSac (formerly AppleSac). What they make is basically the opposite of the Incase sleeve: natural materials, velco flap, and not formfitting.
Most engineers and other people in industry have heard of t-slot (80/20, MayTec, Bosch Rexroth, etc) aluminum. It’s kind of like a grown up erector set, made of extruded aluminum and brackets. You can make just about anything out of it from industrial equipment enclosures to XY plotters to furniture. While is it well suited for these large applications it’s over sized for most smaller DIY type projects. This is where MicroRAX comes in. They supply a miniature version of t-slot measuring just 10mm x 10mm.