What you can do to help soften the waxed canvas laptop briefcase will depend on the reason why it's stiff. If it's stiff due to being dry and old then the solution is to re-wax it. If it's stiff due to being new it's a good thing: waxed canvas is distinctive for the speed at that it naturally ages, creating a worn-in vintage appearance and texture quickly. If you're wanting your new canvas bag to feel and look old you should first think about this alternative: USE IT. Sometimes, it's better to build the character and feel that you're after.
Related Waxed Canvas Bags Collections:
Canvas Backpack | Canvas Camera Bag | Canvas Duffle Bag | Canvas Messenger Bag | Canvas Sling Bag | Canvas Tote