How to explain this, I have a zip up cover for my MB and I want to replace it with a hard case as my intended bag has no structural rigidity. All the 'Hard Cases' I have seen are not really that, they are hard protectors that stay on all the time. I don't want that, I just want a fairly sturdy case that will protect my MB from pressures in the bag whilst being carried or when put down on the ground. Something like a clamshell cover that is low profile, fits the MB snugly and is strong enough to absorb pressures without transferring it to the MB inside. Has anyone seen anything like this?