Sack or plastic?
Hmm - when I go overnight, which is usually for one or two nights out, the sleeping bag and sleeping pad go in the bottom pocket of my EMS 5500. The tent poles go in the top compartment, down one side, and the tent gets stuffed into the bottom of the top compartment so it rests on top of the bottom compartment.
I tend to pack the rest of my stuff in plastic shopping bags, just to make sure they stay dry and clean. The bear cannister, if I am carrying it, goes inside the top compartment, next to the tent poles. I have been known to carry clothes in the bear cannister on the way in, if we are splitting the food, as some of that tends to get carried in the attachable side pockets. It goes into the cannister after the meal at night.
I carry a pack cover, so if it rains, that goes over the pack to keep the stuff inside, including the sleeping bag and pad, dry.
Colming out, I'm a lot less picky, since everrything is going to come out and get cleaned and hung up to dry. If it has rained and the tent is wet, I surround it with the platic bags, just in case there is something in the pack I want to keep dry.
At home, I store the tent and the sleeping bags in these big platic rubber maid container, so they are not compressed at all. My instructors at the Loj in the course I took suggested doing that to keep them from losing loft or getting comressed and creased. The sleeping pad are stored inflated, but with the valves open, behind the couch.
The only time I put the stuff in stuff sacks is when I'm car camping with my daughter and my sister. Then it's just to sort of keep it contained, because we tend to take way too much stuff - Remember the story of the Princess and the Pea? That's my sister when she goes camping - I never knew how many variations there were of blow up mattresses and how many you could get into a single tent!