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  • Big Agnes - Thunderhead SL Sleeping Bag: 30 Degree Down - Charcoal
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  • Big Agnes - Thunderhead SL Sleeping Bag: 30 Degree Down - Charcoal

Big Agnes Thunderhead SL Sleeping Bag: 30 Degree Down

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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
    • Item #BAG00AJ

    Tech Specs

    [shell] nylon ripstop, [lining] nylon taffeta
    650-fill DownTek
    [shell] DWR finish, [insulation] hydrophobic down treatment
    zipperless, with hook-and-clip system
    Max User Height
    [regular] 6ft, [long] 6ft 6in
    Shoulder Circumference
    [regular] 62in, [long] 64in
    Hip Circumference
    [regular] 52in, [long] 54in
    Foot Circumference
    [regular] 37in, [long] 39in
    Draft Tube
    oversized anti-draft collar
    Pad Retainer
    [width] 20in
    Fill Weight
    [regular] 12oz, [long] 14oz
    Stuff Sack
    mesh storage bag
    Stuff Size
    nylon stuff sack
    Claimed Weight
    [regular] 1lb 12oz, [long] 1lb 15oz
    Recommended Use
    Manufacturer Warranty

    Tech Specs

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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.