My wife and I have the REI Trekker 1.75" sleeping pads. They seemed to be the best compromise on size, but still be comfortable. I'm able to get a fairly good night rest with those. We can fit both sleeping pads and both our sleeping bags in a Dry bag that one of us carries behind us on our seat. The other person carries the tent although we just upgraded to a Kelty Gunnison 3.1 and it packs pretty small compared to our old cheapy tent we had. We also bought a Kelty Gunnison 2.1 for when either of us go solo camping and it really packs light and small. When we do that, one of us can get the tent, sleeping pad, and sleeping bag all in 1 dry bag.
We recently had some guests from Washington State spend the evening with us and they had a queen size air mattress that I was amazed at how small it folded down to. It even had a rechargeable pump that pumped it up and deflated it and it was pretty small too. I would say it took up less room than our 2 sleeping pads did. He was able to store their tent, air mattress, sheet for the air mattress and 1 sleeping bag that they opened up all in 1 side case on his BMW 1200.
BlueLghtning screwed with this post 07-18-2012 at 11:00 AM