I recently Purchased the Kajka 75 FjallRaven and have the standard nothing speial packs I haven't event botherd trying but my favorite is my Marine Corps Issue Arc'teryx Leaf pack. Insane pack but you could buy 4 Kajka 75's for 1 Arc Leaf pack. The leaf pack is also made specifically for Law Enforcement or Armed forces so the newest packs encorparate features geared towards storing a rifle which may or may not be something you like.
Skip Osprey they are nothing special but always touted as the best or MHM which I like but not nearly as much for about the same cost. North Face had a Pack featured in Backpacker magazine but the Kajka 75 is just not well known.
