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About Mountainsmith Eclipse Backpack - Internal Frame

Closeouts. From weekend backpacking trips to minimalist backcountry treks, Mountainsmith's Eclipse backpack does it all. The molded back panel keeps air flowing for cool comfort on long hikes, touch-fasten lash points keep trekking poles handy and exterior sleeping pad compression straps free up space inside the pack.


Specs about Mountainsmith Eclipse Backpack - Internal Frame

  • Pack material: 450 denier polyester body fabric (100% recycled), 420 denier nylon Velocity body fabric
  • Frame type: Internal
  • Frame material: High-density polyethylene (HDPE)
  • Hydration compatible: Yes
  • Pack loading: Top
  • Recommended use: Backpacking Multiday
  • Dimensions: 26x12x10"
  • Pack capacity: 3120
  • Volume liters: 54L
  • Weight: 4 lb. 12 oz.
  • Fits torsos: 17 - 22"
  • Made in Viet Nam
  • Visit our Backpack Guide


Do you own this product? Write a review and help others with their buying decisions!

4.166666 5 Overall Rating: 4.2 Based on 18 reviews

Most Helpful 5-Star Review

Durable, spacious, simple, no-nonsense pack
Verified Buyer Reviewed by Ryan from Tennessee on Sunday, June 1, 2014
This pack is a killer deal! For less than a $100, you get a pack that is just as good as a pack twice as expensive. I've used this pack for multiple overnight and weekend trips and each time it served its purpose exceptionally well. For more experience backpackers this would even be a great pack ... Read More
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  • Functional bag
    Verified Buyer Reviewed by J from Tn on Tuesday, October 7, 2014
    This bag appears to be what I was wanting. It is adjustable and functional to the level that I need. The price was right. I will be able to really say how good it is once I beat on it for three months.
  • Lightweight, yes. Comfortable, not for me.
    Verified Buyer Reviewed by SpiritHiker from Arizona on Wednesday, October 1, 2014
    I am a female with a medium frame (5' 7" 135 lbs) and I did everything I could do try to adjust the straps, move the pack up or down and it still was the most uncomfortable backpack I have ever tried on. I am contacting Sierra to return this one, since there is no way I will be taking it backpacking anywhere. For now, I am going back to my much heavier but way more comfortable Dana Design pack. Too bad, because I like the Mountainsmith brand for quality (just bought one of their 2-person tents and love it) but this backpack just would not conform to the curve of my back, the straps were cutting in to my shoulders no matter what I did and it felt completely "off." I think I have learned that just like shoes, I can't purchase backpacks online - no matter how great the reviews are! Have to try it on!
  • Excellent Investment
    Verified Buyer Reviewed by New Trekker from Virginia on Friday, August 29, 2014
    This backpack holds a lot of things. I have never backpacked before and just returned from a trek on the Inca Trail in Peru. While I carried too much with me, this pack worked out great and was very comfortable. I also checked it on my flight back, and I was concerned that it would not hold up very well with the baggage handling process by the airport, but it made it in one piece, with no extra wear and tear. I am approximately 6 feet tall, and this was a comfortable pack for me,but my guide carried my pack for a bit on the trail, who was about 5'6'', and he was able to adjust it for it to be comfortable for him, as well. Overall, great investment!
  • great 3 to 4 night pack
    Verified Buyer Reviewed by mike from Pennsylvania on Monday, August 11, 2014
    Got this for a mountain trip to Colorado. Internal hydration pouch was nice. Light and comfortable. Used to a separate sleeping bag compartment. Otherwise a great value.
  • Nice Pack
    Reviewed by Tim from Ohio on Tuesday, June 10, 2014
    While I haven't used it yet, other than fitting it and walking around the house, I did want to put a review in as it really does wiegh in at 3lbs 8oz on the button. It seems very heavy duty and I'm looking forward to years of use. Lots of adjustability and a very simple pack. Great deal at this price.

Question & Answer

Questions about this product? Get answers from community and staff experts.

  • “Does this pack include a rainfly?”
    Asked by yippinyahoo from The Keystone State on 7/31/2014 7:57:02 PM
    • No this pack does not come with a raincover. You can buy them seperately on Mountainsmith's website for $20-25. Personally, I never use a rain cover. I just line the inside of my pack with a trash compactor bag, roll up the top of the bag, and everything stays dry.
      Answered on 7/31/2014 9:37:19 PM by Ryan from Tennessee
    • No, but you can buy it separately.
      Answered on 7/31/2014 9:43:37 PM by weathered worker from New Mexico
  • “is it lightweight ?”
    Asked by Johnny the Hiker from Colorado on 4/29/2014 9:04:35 AM
    • According to the product specs above: Weight: 4 lb. 12 oz.
      Answered on 4/29/2014 5:41:52 PM by Product Specialist Greg from Sierra Trading Post
    • Myself and one other reviewer have wieghed this pack at 3lbs 8oz, I don't know where the extra pound came from in the description.
      Answered on 6/10/2014 8:25:59 AM by Tim from Ohio
  • “what is waist belt size? ”
    Asked by JP from Miami on 4/24/2014 5:51:42 PM
    • The belt itself is 5" wide. It can fit waists sizes from 30 - 50"
      Answered on 4/25/2014 4:23:48 PM by Product Specialist Greg from Sierra Trading Post
  • “1 much does it weigh ,,, also ....2...what is the cu inch capacity”
    Asked by stissing from new york on 1/31/2014 3:52:40 PM
    • According to the product specs above:
      •Pack capacity: 3300
      •Weight: 4 lb. 12 oz.
      Answered on 2/3/2014 10:25:52 AM by Product Specialist Greg from Sierra Trading Post
  • “What size torso would this pack fit ?”
    Asked by pk from Unknown on 11/4/2012 12:00:00 AM
    • It fit torso sizes from 17" to 23".
      Answered on 11/6/2012 12:00:00 AM by Prod Spec Kevin from Sierra Trading Post

About Mountainsmith

Founded in 1979 by legendary outdoorsman Patrick Smith, the Mountainsmith brand has become synonymous with rugged, adventure-ready gear, including tents, sleeping bags, backpacks, fanny packs, trekking poles and the popular modular hauler system. For more than 35 years, Mountainsmith backpacks and lumbar packs have been engineered to meet the rigorous demands of backcountry adventure. Whether it’s an alpine climbing expedition or an easygoing day hike, you can trust these products to go the distance. Experience the difference for yourself, and you’ll quickly understand why Mountainsmith is fittingly represented by an anvil logo. Mountainsmith backpacks, tents and camping gear are simply among the most reliable on the market today.