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Drop weight, not warmth.

The Big Agnes Pin Ears SL 20 Degree Sleeping Bag is optimized for ultra-light backpackers looking to ditch weight without sacrificing warmth. It's rated to 20F, giving you versatility for three-season outings and milder winter conditions. 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. An oversized anti-draft collar wraps around the entire body to create a 3D barrier against cold spots.

It's stuffed with DownTek 650-fill insulation, which maximizes lofting power while improving compression for compact carrying in your pack. To handle wet conditions, the down insulation features a hydrophobic treatment that repels outside moisture from compromising its heat-trapping loft. For even greater warmth, vertically structured sidewalls with diagonal baffles wrap around your body, much like a cozy cocoon. Another nifty design feature is the half-pad sleeve, which keeps you secure while allowing your feet to freely move.

  • Ultra-light sleeping bag for minimalist backpackers
  • Rated to 20F for three-season and mild winter use
  • Zipperless design with a hook-and-clip system
  • DownTek 650-fill insulation for lofty warmth
  • Hydrophobic down treatment repels moisture
  • Oversized anti-draft collar seals in body heat
  • Half-pad sleeve for a secure sleeping platform
  • Based in Colorado's Rockies, Big Agnes makes premium camping gear
  • Reviews
  • Q & A
Unanswered Question

Is this bag insulated the full length of the bottom or unisulated in the pad sleeve area ?

Super Comfortable but Temp Rating Off

  • Familiarity: I've put it through the wringer

I have slept in this bag on over five trips in the backcountry and have come to LOVE the Big Agnes sleep system. Having the pad slide into the back of the bag ensures I stay on my pad all night, and sleeping directly on top of the pad has not bothered me at all. The fill in the bag is super comfy and not having a zipper has not proved to be fatal. Although, losing the zipper makes the bag less noisy, you still have to shimmy in and out, so you will still most likely wake up the person next to you, as you wiggle your way out.

My only caution is that if you are a cold sleeper you should really consider other options. I took this bag into temps ranging in the teens (with an additional liner) and was still very cold (even with heavy thermals and multiple layers on). I ended up having to swap with my tent mate, whose bag was rated the same temperature but just proved to be much warmer. The only other thing I can say is be careful getting in and out and make sure that all the loops are undone. I ripped off one of the clasps trying to get out of the bag in the middle of the night.

That being said, for use at any temperature over freezing, this has become my go to bag, and I highly recommend it.

Silent Sleeper

  • Familiarity: I've used it several times

This bag is warm, light, comfortable, and doesn't move around. We used this bag on a night when the temps got down in the high 30's and it was perfect. I love how the pad sleeve kept the bag in place all night. The zipperless feature was nice since we were sleeping so close to each other that it didn't make noise when you had to relieve yourself at night.

Highly recommend this bag!

Silent Sleeper

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.

I like this sleeping bag

  • Familiarity: I've used it once or twice and have initial impressions

It's one one the roomiest mummy sleeping bags I've ever slept in. It offers plenty of room to stretch out. I think it exceeds the rating for 20 degrees Fahrenheit I was comfortable in it at around 5 or 10. The only thing I would change is that I wish the opening was a little bigger. I'm 6'3" and I found it hard to get in and out of it. My impression might change as I use it more this summer for backpacking but as of right now I love it .