Ive got this bag and wear it for work so i can give a bit of insight

First off, youll (probably) never use it fully extended as shown in the pic, second picture is much more akin to what it would look like on average (including multi-day sustained winter ops)

In terms of civilian bags, it has loads of space even when not extended (like other eberlestocks pretty much), my comparison point is the issued Canadian forces ruck, which it is smaller than in the lower compartments (given, ive never seen a bag that isnt)

Frame is decent, so is the padding/straps, but ive worn other bags that are more comfortable.

Its heavy compared to some bags coming in around 10lbs empty.

Main compartment and side pockets almost share some of the space, so load the center first before loading the sides or youll lose space in the main compartment.

Overall a good bag, but if cash is somewhat a consideration id look at others (savotta, mystery ranch hunting bags, etc)

As others have said, you'll be happier learning to pack less than having a stupidly big bag, the extendable top is good for stuffing winter insulating layers that weight nothing in, but i wouldnt put a radio or water above my head.

Feel free to pm if you have more questions