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Western Mountaineering Bag Expander - Moosejaw
 
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Western Mountaineering Bag Expander
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Western Mountaineering Bag Expander

Western Mountaineering Bag Expander is rated 5.0 out of 5 by 10.
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The Western Mountaineering Bag Expander adds the extra space needed to your favorite Western Mountaineering sleeping bag. Do you have wide shoulders or sleep like a tornado? Never fear! You can now slide into your bag comfortably and roll around as you please with this handy bag expander. It makes the bag just wide enough for more comfort as you sleep.

Product Description
Item No.   10090172

The Western Mountaineering Bag Expander adds the extra space needed to your favorite Western Mountaineering sleeping bag. Do you have wide shoulders or sleep like a tornado? Never fear! You can now slide into your bag comfortably and roll around as you please with this handy bag expander. It makes the bag just wide enough for more comfort as you sleep.

FEATURES of the Western Mountaineering Bag Expander

  • Designed to coordinate with only Western Mountaineering sleeping bags
  • Instantly provides more space in sleeping bag
  • Great for creating extra room for warmer weather camping
  • Also allows you to squeeze into a Western Mountaineering sleeping bag with a snuggle buddy

Product Specifications
Best Use: Mountaineering and Alpine, Ultralight Backpacking, Backpacking
Weight: 3.5 oz
Disclaimer: We only ship this brand to US Addresses.
Gender: Mens
Fill Details: 850+ Fill Power Goose Down
Product Reviews
Rated 5 out of 5 by from Can't wait to use it After an uncomfortable early spring overnight trip, I've decided to get a warmer bag but don't like the closed in feeling of a mummy. I knew I wanted another WM bag and this seemed like a good way to add a little room without sizing up to a larger bulkier bag. I tried it out on my daughter's Versalite and it felt like a perfect fit. Now to order my bag and wait for it to get cold again.
Date published: 2022-06-08
Rated 5 out of 5 by from Great product Being a bigger guy, this is a perfect addition to my Versalite 10 degree bag. It weighs next to nothing and gives me the little bit of extra room I need to sleep more comfortably at night. The Alpinlite was a better fit for me than. The Versalite (being 2 inches bigger around the shoulders and hips) was a better fit for me, but I wanted a 10 degree bag for an early PCT thru hike start for 2020, so this was the perfect solution!
Date published: 2019-12-26
Rated 5 out of 5 by from Perfect slice of fit I purchased this expander just before leaving for Elk season knowing I may need a couple extra inches and boy did it come in handy, at 10 degree's I slept like a squirrel in a tree.
Date published: 2019-11-14
Rated 5 out of 5 by from Three Season Sleeping Bag Expander Western Mountaineering makes the finest down sleeping bags and accessories. This is the second expander I have purchased from Moosejaw. While their products cost a bit more you get the highest quality. This is the accessory you want if you toss and turn in your sleeping bag. I highly recommend the expander for comfortable sleeping. Enjoy!
Date published: 2019-06-09
Rated 5 out of 5 by from Made all the difference I have an Alpinlite 6' sleeping bag and I bought it because of its larger size. After using it a few times I wished it had just a bit more room. This expander made all the difference for me. It made the bag much roomier! Awesome...
Date published: 2019-02-18
Rated 5 out of 5 by from Worked great with my Alpinlite! I have wide shoulders and tend to toss and turn while I sleep so I’ve always had trouble sleeping well in a mummy bag. When I first got my Alpinlite it was a revelation. Now that I’ve added the expander as well, it’s even more comfortable. Was in the Emigrant Wilderness last weekend in the low 20s with 30mph wind gusts, and I was toasty and comfortable the whole night. For those that prefer extra comfort and sleeping through the night over adding 5.6oz, I highly recommend!
Date published: 2018-05-07
Rated 5 out of 5 by from Typical westernmoutaineering The quality does not disappoint! I’m 6’ 250lbs and it allows me to more comfortably fit into my Alder MF. All of their stuff is top of the line and this is no different!
Date published: 2018-02-02
Rated 5 out of 5 by from Great addition Adds a great deal of room to already great WM bags. Allows the addition of down jacket to boost warmth if needed. Well made like all WM gear.
Date published: 2015-10-16
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How much girth does this add to a sleeping bag? 

Asked by: SaltyOtter
Hey SaltyOtter, great question! This will add approximately 6" of girth to your bag, I hope this helps!
Answered by: Marty Moose
Date published: 2021-10-24

What size zippers are on this expander?

Asked by: Jbone
Great question! The Expander zippers are manufactured by YKK, and are of the 5CN size (for a 6mm coil-style zipper). The main zipper pull is double-sided. I hope this info helps!
Answered by: Foxxy Cleopatra
Date published: 2021-07-24

Hi! Do these fit with the Longer 6'6" sleeping bags?

Asked by: SarahMaple
Hey there, thanks for your question. According to Western Mountaineering, their bag expander works best with their 6 foot bags. However, since most of the length is added to the footbox below the zipper, the expander will work with any bag length. There may just be a slight overlap but nothing that would drastically impact performance. I hope this helps!
Answered by: Gator
Date published: 2022-06-29

How many inches is this expander?

Asked by: jennifer
Hey jennifer, great question! The Three Season option is 66" while the Summer is 68", both work best with the 6' Western Mountaineering bags. I hope this helps!
Answered by: Marty Moose
Date published: 2022-04-02
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Size Guide