Free 2-Day Shipping on Orders Over $50*

Detail Images

  • Mountainsmith - 3/4 Back
  • Mountainsmith - Side
  • Mountainsmith - Mayhem 45L Backpack - Anvil Grey
  • Mountainsmith - Mayhem 45L Backpack - Moroccan Blue
  • Mountainsmith - 3/4 Back -
  • Mountainsmith - Side -

Current Color

  • Mountainsmith - Mayhem 45L Backpack - Anvil Grey
  • Mountainsmith - Mayhem 45L Backpack - Moroccan Blue

Mountainsmith Mayhem 45L Backpack

sale $127.96 - $159.95

Free 2-Day shipping on orders over $50*

Select a Size:

Select options
  • Select options
    • One Size

    Select a Color:

    Select options
  • Select options
    • Anvil Grey
    • Moroccan Blue
    Pinnacle Trekking Pole - GWP'/>

    Free gift with purchase!

    Pinnacle Trekking Pole - GWP


    2 Reviews


    Carry of lots of gear in a simple design.

    Bring the ruckus on your next weekend-long backpacking excursion with the Mountainsmith Mayhem 45 Backpack. Crafted from the insanely durable multi-ripstop Cordura fabric, and with a giant asymmetrical zipper opening, the Mayhem is ideal for everything from gear-intensive day trips to short backpacking escapes. A spring steel frame, PE framesheet, and Anvil Airway EVA support construction delivers a fit and feel that's equal parts comfort and stability, which is only furthered by the adjustable waist belt. This waist belt also allows you to safely stash a smartphone in the built-in pocket. A bevy of pockets ensures you're never short on the gear you need most through your adventure, and generous tool and trekking pole attachment points keep your bigger items close at hand when you need to scramble with your hands free.

    • Cordura construction
    • PE frame sheet
    • Spring steel frame
    • Anvil Airway back construction
    • Ice axe/ trekking pole construction
    • Adjustable waistbelt
    • Multiple pockets
    • Compression straps
    • Item #MOU002S

    Tech Specs

    305D multi-ripstop Cordura HP, 610D Cordura HP
    2745 cu in
    spring steel frame, PE framesheet, Anvil Airway EVA
    Waist Belt
    Hydration Compatible
    1 front mesh stash, 1 side zippered stash, 1 side water bottle, 1 smartphone, 1 mesh storage
    Gear Loops
    Ice Axe Carry
    Trekking Pole Carry
    Weight Capacity
    45 lb
    27 x 12 x 9 in
    Claimed Weight
    3 lb 8 oz
    Recommended Use
    hiking & camping
    Manufacturer Warranty

    Tech Specs

    • Reviews
    • Q & A

    What do you think about this product?

    Have questions about this product?

    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!