Tried this elsewhere and I'm going to try rewording my question. I'm rather a newbie never backpacked but go on day hikes.
I have some gear (4 lb tent; 3.5 lb sleep system), obviously not an ultra-lighter. I'm looking for a backpack for hut to hut (sleeping bag only); overnights and maybe a weekend backpack trip.

I do not think I should look for a frameless pack, but don't want to go crazy with weight or size. How many liters do I need? Also what do you think of the following bags for my purposes.

Looking the following: Osprey 38 or 48; Deuter ACT 40 (or 45)+10; Granite Gear Crown 2 38 or the Granite Gear Lutsen 45.

Thanks for the help.