From pictures, this bag is more than crushed under a very heavy object.
Crushing will not result in leather becoming stiff and crispy.
It is the lost of the leather fatliquor (fat and oil) that causes all these additional other bubbling and flattening too.
It is more of a dry solvent or heat that comes in contact that is the real culprit.
Repairs, is possible; but will be tedious to have the affected areas relax and soften before fatliquor is replenished to retain back to the original shape.
This restoring back to original will require more patience as the shrink leather needs to gradually stretch without causing further damages.
To do it yourself you may need this Kit A6.dr to restore the leather. Gold plating will need a specialist. Otherwise, you may send to Leather Doctor® to coordinate the services.
You may refer to this Problem Solving Guide for Aniline leathers>
Leather-Safe Problem Solving Guide (A) – Aniline Leathers
Products mentioned are found in this Kit A6.dr
Leather Doctor® Kit A6.dr
Roger Koh
Email: [email protected]