You never mentioned what your frame was made of and it was assumed to be aluminum, therefore an ALICE system.
The MOLLE Rifleman's system (which replaced the ALICE) has a plastic frame, also external. The newest generation is claimed to be nearly unbreakable. I have one and it's comfortable, though I haven't put massive weights in it yet. The MOLLE shines in it's ability to add smaller bags and strap stuff to it due to all of the loops on it.
I understand you can use the MOLLE plastic frame with an ALICE pack. They are fairly cheap from surplus outlets or the auction site.
If you don't want to, or can't put out hundreds for a pack, the military packs will do the job. I use an SDS 3 Day Assault pack to haul stuff around everyday, as I ride a motorcycle. I've used it hard for 3 1/2 years, often loaded-up, in all kinds of weather, and it's never failed me. The zipper still works like new too.
I also have a 3 day assault ready to go as my Bug-Out-Bag.
Check out YouTube for a bunch of videos with reviews and even how to strap the pack to the frame.