Is this going to be an internal or external frame pack? For an external frame pack, I'd get a large compression sack (cheaper one for synthetic bags, costs about $10). Then I'd roll the sleeping bag around the tent, stuff both into the sack, and strap it to the top of the pack. If you have a foam sleeping mat, that straps to the bottom of the pack. With an internal frame pack, they usually aren't made well for strapping stuff to the top of the pack. Anything you strap to the top will usually crush the items in the floating lid pocket, and the top pocket and anything strapped to it tends to shift around a lot (requires straightening out a lot). These packs often have daisy chains running down the back of the pack so stuff can be strapped there, but anything heavy in this location will throw off your balance and mess up your back. I wouldn't strap anything heavier than a closed cell foam sleeping mat there (or maybe the tent poles). The bottom of internal frame packs often have a spot to strap a sleeping bag or tent. This is the best place to strap something to the outside of an internal frame. However, because of the location and because the plastic strap patches are fighting gravity to avoid breaking, you aren't going to want anything heavier than 5 or 6 lbs. in this location. For an internal frame pack, the best location for any heavy gear is inside the pack. Most internals are best for one or two person tents stored inside them. Any larger of a tent, and I suggest you stick with an external frame pack with the tent strapped to the top.