Backpacker Magazine in its August 2006 ultralight gear guide calls the Gossamer Gear Thinlight pad, “fanatically light”, a 1/8-inch thick pad of closed cell foam that tips the scale at a mere 2 ounces.
About the only thing you could find thinner would be a pad made of dragon fly wings.
Think about the ultimate lightweight gear set: 4 ounce pack, 1 pound sleeping bag, 2 ounce pad, and 10 ounce tarp …. Just 2 pounds for all your basics. This is not a dream. These products really exist.
You might be wondering “why bother?” with such a minimalist pad since there is so little of it between you and the ground. Well, if you like a firm bed and need very little cushioning, then the Gossamer might be just the ticket.
I remember my first year as a lightweight backpacker when I absolutely eliminated every single fraction of an ounce. I would have bought it in a heartbeat.
For a Few Ounces More
Today, I allow a few more ounces for comfort on certain items. Personally, the Bozeman Mountain Works TorsoLite, a 32-inch long, 1-inch thick self inflater, at 10 ounces, sounds like a more reasonable choice. The TorsoLite rolls into a 4-inch by 9-inch cylinder, which is approximately the size of a 20-ounce soda bottle.
Be safe. Be light. Be one with the pack.