Outside Magazine reviews the Big Agnes Tumble Mountain 20 sleeping bag, which has specially designed baffles to keep you continuously warm. The designers are using a new technique: injecting down into the fabric sleeves along with small, internal mesh barriers that keep it in place. The process requires longer baffles, so Big Agnes ran them lengthwise, making it unlike any performance bag

* Features the patented Flow Construction by Big Agnes/Insotect which revolutionizes down sleeping bag design
* Integrated pad sleeve with unique design keeps you securely attached to the pad from the hips up while allowing freedom of movement for your legs- more like a traditional mummy bag. Never roll off your pad again
* Features the patented Flow Construction by Big Agnes/Insotect which revolutionizes down sleeping bag design
* Half pad sleeve with adjustable strap holds ANY 20″ wide rectangular or mummy shaped pad
* Mummy shape decreases weight & packed size
* Recycled mesh storage sack & nylon stuff sack included
* Built in pillow pocket holds a fleece or Big Agnes pillow
* Interior fabric loops for sleeping bag liners
* 70″ YKK #8 zipper made from 100% recycled materials. Mate together our left and right zip bags with the same size zipper
* No-draft collar seals around neck to keep cold air from sneaking in
* No-draft wedge insulates the connection between the bag and the pad
* No-draft zipper tube insulates along the length of the zipper
* Shell and Pad sleeve: Lightweight 100% recycled polyester rip-stop with WR surface treatment to repel water
* Lining: 100% recycled polyester taffeta with stain resistant finish
* LEFT OR RIGHT ZIPPER? When you are in the bag, on your back the left zip will be on your left side
* Patented Flow Construction by Big Agnes/Insotect eliminates lateral and vertical down shifting by using vertical chambers with internal Flow Gates to regulate fill positioning and density. Strategically placed Flow Gates inside the vertical chambers minimize vertical down shifting while vertical chambers themselves minimize lateral shifting. The continuous Flow chambers eliminate potental cold spots which can occur with side seams and contour to the body for increased user comfort