The typical bottles we have won't recover their original shape when crushed. They will attempt to reform slightly but only slightly. I believe the pressure in

The typical bottles we have won't recover their original shape when crushed. They will attempt to reform slightly but only slightly. I believe the pressure in any pocket of gas in the bottle would increase due to degassing of the fluid and this pressure would have a greater impact. Especially if that degassing was encouraged - e.g. shaking the bottle. In contrast, I can't see that manipulating the bottle in an attempt to recover its shape would encourage further degassing.