I'm using the SN30 for EDC, and while it can certainly hold much more than I carry on a daily basis, it nicely accommodates even my sparsest carries. I'm 6'3" and the size is fine for me. Routinely I'll carry a 20oz BlenderBottle in the water bottle pocket, an iPad or (less often) MacBook Pro 16 (in the laptop compartment), various books/notebooks/papers/folders, keys, etc. I also have a size 2 HLT (with the missing webbing on the back... not sure I want to bother with sending it back for that addition) which I keep in the exterior bottom pocket. Normally the bag feels underloaded, but that's fine for everyday. I'm happy to know I have the room if/when needed, but really, even with the very little in the bag, it never feels too empty, or "saggy" (internal frame I guess). I have the black 525 ballistic/island, and I like the colorway. I nearly went halcyon when I ordered, but decided I wanted a slightly heavier feeling fabric that would hold it's shape better... I'm happy with that.
Cheers.