I’d recommend visiting an outfitter or an REI store if you have one relatively close to you to get sized for the right pack. Me personally, I prefer to have several different packs, tents, and sleeping bags for various trips. I have a military modular arctic sleeping bag for those cold winter months or car camping, for 3 season spring to fall backpacking trips I have a Marmot Plasma 15*. Same for packs, I have a Gregory Denali for long expedition type trips that require a lot of gear and have a North Face pack for lighter trips.