The thought of you putting them on your 777 makes me want to :'-( I took my GF-575 apart to fix a few screw posts and was amazed how brittle the plastic case was. Even with some form of stress reducing strips inside to spread the load I would say they'd part company very quickly, Not talking from experience but from putting a strap points on a fishing tackle box I had. Looked great but lasted about 10 minutes walking, crashed to the floor spilling my gear, including my beloved Penn multipler everywhere. :annoyed: