MBP 13" body is flexing in my bag, rocking on a flat surface

Certainly this is an automatic solution but my worry was not about manually correcting any flex so much as the possibility of the flexing, even a small amount, causing internal flex on the logic board.

I'm worried about the chances of the internal structure of the machine being so tight (because Apple design to be thin) that there is no accounting for this sort of twisting of the body.

As it is I am now using a laptop backpack, but this is a poor solution for me as my bike bag is waterproof and a lot easier to ride with. I've read a few other people notice this flexing in MBP's but it appears to mostly be noted as "rocking on a flat surface".

So really I am asking if anyone knows if Apple's design accounts for the flexible nature of Aluminium!

It genuinely is the case, and not at all hard to cause. Unless my MBP is shockingly defective structurally.

Let me explain more accurately.

My bag is a chrome mini metro (if you wish to see how this works) which has a strap design which holds the bag diagonally across the back with the opening starting at left shoulder and ending by the bottom right rib. The MBP is just long enough to fill this space nearly all the way across and as such will have a diagonal divide across the base against my back with say the back left corner near my left shoulder and the front right corner down toward my right rib, like the bag.

I think what happens is any tug on the strap (light as that may be) causes pressure to be on the front left and back right corners so the flex is again diagonally over my back. This I establish from the way the bag sits and that the MBP rocks very slightly on those two corners feet when on a flat surface (glass desk, table, workstation desks at work etc) so that the back left and front right feet may leave the desk alternately.

Interestingly this only appears possible on in that direction and not rocking across the other two which makes me suspect the framework inside the body is slightly weaker in that direction due to the way it has to contain asymmetric insides.

So when I say flexing the other direction I mean pushing gently on the two corners that rock up and down flattens it out. We are talking a millimetre here, perhaps two. And the pressure applied to reset the shape is less than I would even apply by resting on the machine to type so you can see very minimal effort is required from the bag or my hands.. But yes, I am really worried about this happening either way.

When I say it settles after a while, this is probably due to it's own weight and my hands on it, the pressure really only needs to be that gentle.

Just another example

http://forums.macrumors.com/showthread.php?t=739304