In years gone by, a certain number of GIs at Ft. Bragg were substituting a Coleman plastic pack frame (Peak One?) for the GI aluminum pack frame. They still used the ALICE pack itself, just with a different frame.
Mindset - Skillset - Toolset. In that order!
Attitude and skill will get you through times of no gear, better than gear will get you through times of no attitude and no skill.