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Information about Mountain Hardwear Fluid 18 Backpack
Closeouts. Mountain Hardwear's Fluid 18 backpack combines stability and a streamlined design for fast and light backcountry outings. The back panel has air channels for ventilation and lumbar padding for load support.
  • HardWave framesheet keeps back panel flat for stability without compromising flexibility
  • CoolWave suspension with air channels and breathable mesh back panel and lumbar padding
  • On-The-Fly side compression straps let you adjust the load while wearing the pack
  • Top-loading main compartment with spindrift collar and easy-access side zipper
  • Attached lid with external compartment and zip mesh inner compartment with key fob
  • Zip access hydration sleeve with dual ports (bladder not included)
  • Front compression pocket with side stretch panels
  • Stretch side stuff pockets
  • Breathable mesh waistbelt with zip mesh pockets
  • Adjustable, padded shoulder straps
  • Adjustable sternum strap
  • Carrying loops for trekking poles or ice axes
  • Made in Philippines
  • Visit our Backpacks Guide
  • US shipments only
Specs about Mountain Hardwear Fluid 18 Backpack
  • Pack material: Body 100 denier HT ripstop dobby nylon, Accent HardWear X-Ply ripstop, Bottom 420 denier HD nylon
  • Frame type: Internal
  • Frame material: High-density polyethylene (HDPE)
  • Hydration compatible: Yes
  • Pack loading: Top
  • Ice tool/trekking pole loops: Yes
  • Recommended use: Backpacking Day or Overnight,Climbing,Daypack
  • Volume liters: 18
  • S/M:
  • Dimensions: 21x10x5"
  • Pack capacity: 1100 cu.in.
  • Weight: 1 lb. 10 oz.
  • Fits torsos: 16 - 19"
  • M/L:
  • Dimensions: 23x10x5"
  • Pack capacity: 1220 cu.in.
  • Weight: 1 lb. 14 oz.
  • Fits torsos: 23"
  • Made in Philippines
  • Visit our Backpacks Guide
  • US shipments only

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Most Helpful 5-Star Review

Verified Buyer Reviewed by Jake from Washington on Tuesday, April 22, 2014
When I first received this pack it was a little bigger than I had anticipated, but after having and using it the past few days it is really a nice size. I have been using it for walking back and forth from work ~1 -2 miles a day. It has plenty enough room for my rain coat, a long sleeve shirt, my ... Read More
4.500000 5 Based on 22 reviews: Overall:
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  • Reviewed by neil from portland from portland on Friday, April 17, 2015
    I got this bag last fall and still use it to this day, but there are a few things that I'd like to share with people about it. First of all, the back panel likes being bent, and the bag never sits up straight, even when set down leaning against something. Secondly, many of the zipper ties have fallen off. Not the end of the world, but should be noted.
  • Verified Buyer Reviewed by Danny from NY on Tuesday, March 3, 2015
    The pack is very comfortable. Straps are nice and so is the hip belt. I bought mine in the red color and it looks great. Everything seems well thought-out and the materials are very nice. It's an 18L pack, so it may be on the smaller side for some people. However, it's a great size for a simple day pack.

    It has a compact and slim design. It rides close to your body, and because of the narrow design, it never gets in the way of your arms. The compression straps are very well placed and help to keep things tight and tidy.The mesh pockets can fit 1L Nalgene bottles without issues, so that's always a plus.

    The only potential drawback has to do with the structure of the back. if not fully packed, the back flops over. There is generous foam padding for the upper back/shoulder blade area, as well as the lumbar area. It's the area between them that lacks padding, and that's where it may flop over. It's generally not an issue when you are wearing the pack, but I thought I'd point that out.

  • Reviewed by Tele boy from Tahoe on Wednesday, January 7, 2015
    Ordered this pack for longer mountain bike days when I need to carry more than just water and a snack. Haven't used it yet but it seems well built without excess weight of a full day pack. Does not come with a bladder so I plan to swap in an extra Camelbak one. The inside has one small mesh pocket for keys and a wallet. Some additional internal pockets to keep small items organized would be nice. Really like the side bottle pockets and back pouch to stash the helmet or an extra jacket. As always, can't beat the STP price.
  • Reviewed by Jules from Maine on Tuesday, January 6, 2015
    Great for short day hikes, good weight distribution. The side pockets can hold large water bottles. The hip belt pockets are useful for stashing small items. My only complaint would be that the outer pocket clip comes undone while hiking. I would recommend this pack.
  • Reviewed by Joe from Missouri on Monday, November 3, 2014
    Purchased this for my 11 year-old son to use on overnights. We took it out last weekend and it worked very well. He's pretty skinny, so he had it sinched up pretty well and therefore it did have a lot of extra straps hanging around. but you could tuck those away a bit if you liked and we didn't have an issue with that. It was comfortable and able to fit quite a bit into the pack. It's not for carrying heavy loads, but for a light pack to hold maybe 10 pounds of stuff, it was perfect. It's very light and we found it to be adjustable enough for him. Not sure it would fit all the great on my long torso, but for him it's perfect. The interior pocket was nice, but the extra "pocket" on the back is not terribly functional. But it held a waterbottle on the side well and the tiny pockets on the waistbelt could hold keys or a small snack.

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