• Mountainsmith - Mayhem 45L Backpack - Anvil Grey
  • Mountainsmith - Mayhem 45L Backpack - Anvil Grey
Mountainsmith - Mayhem 45L BackpackView Larger Image

Mountainsmith Mayhem 45L Backpack

50% Off
$79.99 $159.95

Item #MOU002S


Tech Specs

210D HT nylon, 200D SPECRA R/S
45L (2745cu in)
spring steel frame, PE framesheet, EVA/ PU shoulder straps and backpanel
Shoulder Straps:
adjustable, feature load-lifter adjustment
Waist Belt:
2 waistbelt, 1 zippered lid, 2 side stretch
Gear Loops:
Ice Axe Carry:
Trekking Pole Carry:
side straps
Weight Capacity:
26 x 11.5 x 8.25
Claimed Weight:
2lb 15oz
Recommended Use:
hiking & camping
Manufacturer Warranty:

Mayhem 45L Backpack

Whether you're setting off an a dawn till dusk hike or a lightly packed overnight excursion, this pack has the durability and light weight you need to travel any trail. It utilizes tough and tenacious Spectra fibers, which are super strong and highly abrasion resistant, prolonging its life for more adventures and tougher terrain.

  • Durable pack for long day hikes or quick backpacking trips
  • Spectra fibers are ultra-strong but light in weight
  • Ice-axe and trekking pole loops keep hands free when you need them
  • Comfortable back panel and shoulder straps make for easier hiking
  • Waistbelt is supportive, comfortable, and ventilating
  • Load lifter and compression straps adjust your load quickly
  • Side stretch pockets keep water and packable layers close by

Mayhem Pack In Zion

  • Familiarity: I've put it through the wringer

Great pack! Used it hiking in Zion over 3 days about 19 miles covered. Carries a load well, could get weight on the belt. Loved the pockets on the belt are good for phone (camera) and snacks! The hydration sleeve held a 3L HydraPak ShapeShift with only a little out over the top but no issues. Really like the material on the inside of the belt and back panel, just soft and comfortable. Also the stretch panel on the outside works great for stashing gloves, hats, guide book. I have also used this cragging with a 60m rope, draws, helmet, harness etc. and on backcountry fishing trips with waders, boots, net etc. Just a great do it all pack!

Mayhem Pack In Zion

Mayhem 45 Backpack

    Additional features of the Mayhem series of packs include a front panel mesh storage pocket, left side mesh pocket with pass through compression straps, right side zippered stash pocket, angled water bottle pocket on the right, top lid gear pocket with key fob, forward pull waist belt, ridged EVA back panel padding, smart phone compatible waist belt pocket, and generous tool /trekking pole attachment points. The Mayhem is ideal for organized carry of lots of gear in a simple design.

    To bring you peace of mind for your backcountry investment, Mountainsmith offers a lifetime warranty on their products. For a larger everyday carry solution, the Mayhem 45 is the pack for you.

     Mayhem 45 Backpack

    Mayhem 45 Backpack

      The giant asymmetrical zipper opening to the Mayhem 45 backpack make it convenient for gear intensive day trips to short backpacking escapes. Built with a wire hoop frame to offer rigidity, this bag is a sturdy everyday carry option. Combine that convenience with the use of ultra-durable CORDURA® fabric, and this backpack is going to be one of your favorites for trail and travel.

      Mayhem 45 Backpack

      Nepali Coast warrior

      • Familiarity: I've put it through the wringer

      I have a small frame so this bag's frame was a little too high for me. Coming up steep inclines proved dangerous as I'd have to lean out in order to see where I was going. Looking up was not an option, however that probably means better neck protection if I were to have fallen. This bag had ample room. I did not love the color nor the mesh on straps. I understand this is for wicking sweat however it snagged on most anything. Comfortable around the waist to wear not meant for a breasted woman on top with strap.

      Nepali Coast warrior

      Twice used great pack!

      • Familiarity: I've used it several times

      Used this pack twice so far a 5 mile hike in fishing spot and a full day trad climbing outing. Carried the loads great, plenty of room for a day pack, comfortable and great pockets! I don't hesitate at all to recommend this pack.

      Twice used great pack!



         Scream 55Scream 25
        Approach 25
        Apex 80
        Lookout 45
        Mayhem 35
        Approach 35
        Mayhem 45
        Women's Apex 60
        Divide 22
        World Cup 25
        Kids' Pursuit 50
        Torso Measurement

        17 - 21in

        (43 - 53.5cm)

        15 - 20in

        (38 - 51cm)

        17 - 22in

        (43 - 56cm)

        16 - 21in

        (41 - 53cm)

        15 - 19in

        (38 - 48cm)

        13 - 17in

        (33 - 43cm)

        How to Measure:
        Measure your torso length by bending your head forward so your chin touches your chest. Feel for the most prominent bump at the back of your neck. Now measure from that point down to an imaginary line connecting the tops of your hips around your back. This works best with a partner's help.