They are nice. Another thing I noticed was the ease of shouldering my rifle with it. Thicker shoulder pads would be more comfortable, but would make shouldering the rifle more difficult.
I have the MOLLE II main ruck as well with the external frame. With the same weight load it was more uncomfortable than the assault pack, was hard to bend over to pick stuff up, and I did get hung up on a branch or two with the main ruck. Although, for heavy loads and long open trail hikes I think the main ruck would be the way to go. It's much more comfortable than my old external frame and rides much better.
Nice thing about the entire rifleman system is I can attach the assault pack to the main ruck, hike out with all the heavy gear, tent, blankets, pots, pans, etc. set up camp, detatch the assault pack and hike out from there. Or for really light trips I can just use the buttpack/ waistpack, the FLC, or any other combination in between.
Also, both the shoulder straps and waist belt on the assault pack can all be stowed away in the back panel so you end up with a bag and no loose straps flopping around. it has a nice heavy duty carry handle as well.
The benefit of the main ruck is the ability to re-configure it anyway you want. Main ruck + sleep system + sustainment pouches + assault pack + waistpack or anything in between. And as AS showed you can use the external frame stand alone and just strap stuff to it.
If you type this -->TM10-8465-236-10<-- into Google search and click on the first link it should take you to a pdf file that is the operator's manual for the complete Rifleman system. Or just click this link http://loadbearingequipment.info/MOLLE2/ETM086006.pdf If you have this pack the manual is worth a look. It has lots of pics which list all of the components that can be used, configurations, assembly, care, specifications, tips, etc. I like the medic pouches and SAW pouches and may eventually end up getting some. There's so many different pouches it ain't funny.
This is from the manual-
"EQUIPMENT DATA
Component Materials Water Repellant military specified fabrics and composites
MOLLE II Size One size
Weight - Large rucksack with frame and straps 8 lbs - empty
Weight - FLC with rifleman pouches 4 lbs
Large Ruck Volume 4000 cubic inches
Large Ruck Sustainment Pouch Volume 500 cubic inches
Assault Pack Volume 2000 cubic inches"
As you can see the system as a whole is 7000 cubic inches and that does not include the volume of the pouches on the FLC, waistpack, or sleep system carrier which is typically attached below the main ruck. That's probably another 4000 cubic inches or so. In essence you have the ability to customize your setup to anywhere from 0-11,000 or so cubic inches. 11,000 LOL!
I think Rick posted a pic of one of these loaded to the gills on the side of a mule or donkey. Fully loaded it's a massive monstrosity of a pack which was most likely desigend to induce suffering. But, it's versatility more than makes up for that. Here's a video on YouTube that shows how to adorn a fully loaded pack. Yea Right! http://www.youtube.com/watch?v=afu-a...eature=related The pack is not MOLLE II though, but close enough for demo purposes.