The MTN Speed 32 is No Longer Available as of November, 2016The Mountain Hardwear MTN Speed 32 is an incredibly light hooded mummy bag, weighing in at just 16 ounces. This bag combines top of the line down with some of the lightest weight shell fabric and a very slim cut to attain its extremely lightweight. Unfortunately, two main drawbacks limit its usefulness for ultralight hikers. First is the zipper, which is prone not only to snag, but also to separate. Indeed, on the first night of our first test trip with the Mtn Speed, the zipper hung up, and then separated, becoming non-functional for the remainder of the weekend. In our opinion, this is a fatal flaw. In addition, sewn-through quilted construction on the bottom of the bag limits the warmth for all but back sleepers.
Even though it is two ounces heavier, we think the Western Mountaineering Summerlite is a much better choice for ultralight backpackers who prefer a hooded mummy. It is warmer for side and tummy sleepers, and it features a smooth operating, durable zipper. You'll find several more very light hooded mummies in our review of Backpacking Sleeping Bags.