First off, the construction quality and materials are far superior to other backpacks I've tried. You really get what you pay for.
However....For a backpack this size, I have to wonder why the sleeping bag compartment is so small.
I have a Wiggy's SuperLight for cold weather, and a Coleman Peak mummy for warm weather that I have no intention to replace. Even with compression sacks, neither bag will fit in the sleeping bag compartment. A huge disappointment.
The Coleman is roughly 10" diameter, 17" long when reasonably compressed. It won't fit.
The compartment is just not "tall" or "deep" enough, although it it certainly "wide" enough. I think it's technically possible to cram one of the bags in, but it would be incredibly difficult, would require compressing the bags to the max that the compression straps/buckles would allow, and would ultimately put a lot of strain on the compartment and zipper. I suspect the compartment seams / stitching would hold up well to the pressure, but I have my doubts that the zipper would fare as well with the added stress of rigorous trekking. Sit down with the pack on, and you could hear a pop. Then you'd be cursing yourself and Gregory.
I decided to replace the warm weather bag (the 22-year old Coleman) with a Wiggy's Overbag, which compresses easily to 6" x 10". For the cold weather bag, the SuperLight, I plan on using the main compartment. There's just no other way.
