Smatree
Moulded EVA, and why we keep pressing it
A hard shell refuses a knock instead of spreading it. That is the whole argument. Closed-cell EVA pressed hot into a mould is stiff enough to stand on a shelf empty and soft enough to dent and come back, where a rigid plastic box would crack.
Super Corner
The four corners are built up thicker than the walls, because a dropped bag lands on a corner roughly nine times out of ten. It costs mould time and material. It is also the single feature most responsible for a shell coming home intact.
The gap inside
Clearance is cut to the machine, not to a bracket. Enough to get the laptop out one-handed, not enough for it to move once the zip is closed — half an inch of slide is how lids get dented from the inside.
Living with one
Flat outer faces so it slides into an overhead bin or a locker. A back panel firm enough to take a trolley strap without folding. A recessed zip channel so the slider never reaches the lid. A damp cloth cleans it; solvents lift the coating and leave a dull patch that never evens out.
Water
It sheds rain on the walk from the car to the door. It is not a dry bag. Do not put it under water and expect the inside to stay dry.
Picking the right one
Find your machine in the listing, not a number on a box. Bezels have shrunk for a decade, so two laptops with the same diagonal can be quite different rectangles — and the rectangle is what we cut to.