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Minimalist backpacker's delight.

Maximize your mileage without sacrificing warmth on chilly evenings with the Big Agnes Thunderhead SL 30 Degree Down Sleeping Bag. This ultra-light bag allows you to move quickly across large swaths of wilderness without excess weight holding you back. It's rated to 30F, giving you versatility for three-season backpacking trips. The bag's minimalist design saves weight by replacing the zipper with a hook-and-clip system that's both intuitive and silent to operate.

Stuffed with 650-fill DownTek insulation, the Thunderhead SL maintains toasty warmth in freezing overnight temperatures. For wet conditions where traditional down would normally lose its heat retention, DownTek employs a hydrophobic treatment that repels outside moisture from sapping your warmth. To maximize thermal efficiency, vertically structured sidewalls use diagonal baffles to wrap your body, much like a cozy cocoon. This design helps you snooze soundly while your camp partners are shivering inside their bags.

  • Maximize your mileage with an ultra-light bag
  • Zipperless design saves precious weight
  • 30F rating for three-season versatility
  • 650-fill DownTek maintains high-loft warmth
  • Hydrophobic down treatment repels moisture
  • Oversized anti-draft collar retains body heat
  • Half-pad sleeve for a secure sleeping interface
  • Based in Colorado's Rockies, Big Agnes makes premium camping gear
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Big Agnes Zipperless Down Sleeping Bags

Do you hear that? It's the silence in your tent when your bag doesn't have a zipper. No more zzzzzzip sounds when you want to get in and out of your bag quietly. The Pin Ears SL 20 and Thunderhead Sl 30 bags feature a cocoon-style construction with an easy, weight-saving clip and loop system in place of the traditional zipper. With an integrated half pad sleeve on the bottom, a vaulted foot box for ample wiggle room, and vertically structured side walls that trap heat closer to your body, these 650 fill power DownTek™ bags are the perfect all-in-one sleeping bag for backpacking or any backcountry outing.

Unanswered Question

What is the compressed & non compressed size/dimensions of this bag?