I can do an overnighter ( and be very comfortable ) with a TT Essentials MkII 15ltr pack - that is with the addition of some pouches to the PALS, but easily doable - that's a 2 man tent, sleeping pad, down quilt/bag, pillow and SS Cook Kit + Gas Stove.with 3ltrs of water. I'd look at 35l as a luxury pack ... I like TT gear and already use the TT Raid Pack MkIII as my long range multi day loadout. The Trooper could be a nice sweet spot for me ... looking at some of the TAS packs also in the 35L range ... material weight also matters.
hey. Unfortunately it doesn't. But I'm sure you can still put one in with a case. I've seen that the Osprey Laptop bag seems like a good option for what you need.