In reply to UKC/UKH Gear:
I'd be more concerned about the durability of the merino back on the Hybrid, especially when wearing any backpack at all. Merino isn't exactly known for its abrasion resistance, after all...
I feel like outdoor garment designers are always trying to reinvent the wheel with new "hybrids" every new season, which ain't exactly sustainable either – especially if it gets thrashed a few years on because of a stupid design decision like that.