The Very Best Backpacking Sleeping Bags For 2019-- Treeline Evaluation. Lightweight Sleeping Bags and Ultralight Sleeping Bags from Terra Nova Devices - made using the best quality goose down, high specification fabrics and style, integrated with the precision and quality that consumers get out of a world leader in light-weight outside gear. At 12 ounces, the NeoAir XLite is the lightest pad we checked. It packs down to the size of a 1-liter Nalgene bottle and has an R-value of 3.2, on a par with that of other pads in its category (you can't find a lighter pad that's as warm). At 2 1/2 inches thick, the NeoAir XLite was cushiony enough for our 235-pound tester, however not so thick regarding make any of our backpackers feel as if they were falling from a cliff if they mistakenly rolled off. The 30-denier ripstop nylon product on the top of the pad produces a grippy surface area that excels at keeping sleeping bags in place instead of becoming what one tester, describing the competing Nemo-brand pad, called a slick Slip 'N Slide." Our testers discovered that the pad felt stable and even throughout the night.