TETON LEEF vs. Backpacking Bag: Tested Lightweight, Free Sack… Surprising Heat filmmaker favors baseline mummy options sez or alike… (thought!) We recently tested the TETON Sports LEEF Ultralight Mummy Sleeping Bag, eager to compare it with traditional backpacking bags. At just under three pounds, our group found it impressively lightweight for a 3-4 season design, though we noticed a few unexpectedtrade-offs. The mummy shape is cozy but restrictive, perfect for when space is tight—but not as versatile as a rectangular bag for longer trips. Our only real surprise was how well it handled mild temps, though some found it slightly stuffier. The included free stuff sack is durable enough, though it barely cubes as well as we’d hoped. Still, for quick excursions or backpacking, its balance of weight and warmth feels surprisingly effective, earning a spot on repeating trips.