I just spent two nights testing a cheap ($40) inflatable "Sleepingo" sleeping pad from Amazon, and I am impressed! It is about 2 inches thick, so it is much more comfortable than my trusty old RidgeRest closed cell foam (especially for side sleeping). It is about the same weight (my scale says 14.3 ounces with bag), and it packs up much smaller (10" long, 2.5" diameter).

When I was a kid an inflatable mattress was made of vinyl, so it was heavy and likely to leak within a few uses. But the modern nylon fabric pads are very common so I assume they are reliable. Has anyone experienced a leak? Also the old ones took forever to inflate, but this one only takes me about 19 slow deep breaths.