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Fluid™ 18




Perfect for technical outings where speed and stability are critical, this well-ventilated lightweight pack keeps day trip essentials close and comfortable.
$76.90 $110.00
Style# 1454341
product.components.activity: Backpacking / Hiking


    • Color:
    • Size:
      Sizing: True to Size |
    • S/M
    • M/L

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Features & Specs

  • Weight: - 1 lb. 8 oz. / 680 g.
    1 lb. 10 oz. / 740 g. -
  • Reviewers rated this product: - True to Size -
  • Pack Capacity: - 1100 cu. in. / 18 L
    1220 cu. in. / 20 L -
  • Good For: - Backpacking / Hiking -


Perfect for technical outings where speed and stability are critical, this well-ventilated lightweight pack keeps day trip essentials close and comfortable.



  • Fabric Accent: 210D HexNut™ Ripstop Nylon
  • Body Fabric: 100D HT Ripstop Dobby Nylon
  • Body Fabric Content: 100% nylon
  • Fabric Bottom: 210D HexNut™ Ripstop Nylon


  • Pack Weight S/M: 1 lb. 8 oz. / 680 g.
  • Pack Weight M/L: 1 lb. 10 oz. / 740 g.
  • Pack Capacity S/M: 1100 cu. in. / 18 L
  • Pack Capacity M/L: 1220 cu. in. / 20 L
  • Pack Torso S/M: 16.0 in. - 19.0 in. / 41 cm - 48 cm
  • Pack Torso M/L: 18.5 in. - 22.0 in. / 47 cm - 56 cm
  • Pack Waist S/M: 28 in - 34 in / 71 cm - 86 cm
  • Pack Waist M/L: 33 in - 39 in / 84 cm - 99 cm


  • CoolWave Suspension with air channels and breathable spacer mesh backpanel and lumbar provides excellent load support and great ventilation
  • OTF (On-The-Fly) Compression lets user adjust load stability while wearing the pack without restricting motion
  • Large main compartment with internal security pocket
  • Front compression pocket with stretch mesh panels for overloads, helmet, etc.
  • Large zippered mesh pockets on ventilated hipbelt keeps essentials handy
  • Dedicated zip access hydration sleeve with dual ports
  • Super stretchy mesh side pockets offer quick storage/access for water bottles, hat/gloves, etc.
  • Ventilated and soft edge shoulder straps are comfortable on bare skin
  • Carry loops for ice axes and trekking poles
  • Reflective hits for high visibility and safety
  • Imported


Fluid™ 18 4.7 5 7 7
Lots of good features in a small space Great as a small day hike or trail running pack. Holds water, lunch, ten essentials, extra clothing and still has room for a summit treat. External pockets will hold 2 standard liter water bottles or use the hydration pocket. Decent sized pockets on the waist band for compass, snacks, or a phone. Two small D rings on chest straps to clip on a GPS or camera are a bonus. February 8, 2014
Everything you need Great pouches, multiple ways to use and very light. February 8, 2014
Great Day Pack I bought this for a day pack while I was backpacking. It's light and fit in my backpack without taking up too much space. We actually sent one of our packs out on a mule from the hike, and my wife used this bag packed with water and clothes. It was suprisingly comfortable and fit a bunch more than I thought it would. Great Pack! September 3, 2013
nice little bag Works perfect to put a hydration bladder in and I typically put my rain gear in it or extra layer maybe a few odds and ends. It stretches a lot from original size at first when I saw it i thought it might be to small. Used it on a recent fishing trip and hiked around in the river and at times bending over to cut threw thickly forested area's. I honestly would have forgot i had it on if didn't get thirsty. May 7, 2013
Bladder doesn't fit This bag is pretty good. The bladder pocket is only unsewn on the narrowish top. This makes it extremely difficult to insert a bladder. For example you can't have a jacket in the bag and insert a 2.5L Platypus with 2L water. You would have to completely unload the bag. Even when bag is empty, loading bladder is a struggle. Need some side velcro or strap or zipper so loading a bladder is possible. November 7, 2012
Exceptional function This is one of MH's larger hydration packs. It has chest and waist belts/buckles and a great deal of storage capacity. It feels like the perfect compromise between a true hydration pack and a standard daypack, without restricting movement. I am ~ 6'2" and 185 lbs. I am long-ledded/shorter torso, however the M/L fits just right. Call one of the MH's representatives to get guidance on sizing before selecting S/M or M/L. Great product! July 25, 2012
excellent bag! my third Fluid daypack and it's the perfect size for a full-day hiking trip. good dedicated hydration sleeve. not sure what the loop is for above the overload pocket? would like integrated rain cover for all daypacks. overall, a nice pack. April 16, 2012
  • 2015-08-31T05:43:23.371-05:00
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