Looks comfy in the waist and shoulders. How much can the main pack hold CU Inches? Is the only detachable piece the colored smaller pack? How much will you be wearing this pack? What is your main duty going to be while wearing it?
I personally use the FireFly by True North and spend 60% of the Summer in it. The main large pack detaches leaving me the smaller pack for daily needs/light lunch, hydration sleeve and new gen shelter and isnt cumbersome on long day's running saws or swinging a tool. I did need to attach two extra water bottle holders to the waist belt to accomadate the larger pack detach but its far less swinging weight on my lower back.
I have seen the Coaxsher packs in catalogs and on-line, but have never used one. I have been using the low-rider line pack from Crew Boss/ Western Shelter Systems.
Last week I ordered the Top Load pack and a few accessories from The Pack Shack. I like the versatility of a modular system and the customer service that makes small companies like The Pack Shack stand apart from the rest.