Mountainsmith Mayhem 45 Backpack

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Product Information

The 2019 Mayhem 45 was created with Spectra® Fiber, an ultralight, ultra-strong fiber that puts the Mayhem at the top of its class for weight and durability. The Mayhem 45’s volume and its hybrid top and panel opening make it ideal for backpacking weekends, backcountry huts, the local crag, and far away hostels.

Why compromise when you don’t have to? The 2019 Mayhem 45 is ultralight, ultra-durable, and ultra-comfortable. Built with Spectra® Fiber, the pack offers a top tier strength-to-weight ratio. Used by military and law enforcement, Spectra® Fiber is an ultra-high-molecular-weight polyethylene known for its light weight strength and abrasion resistance properties. In the Mayhem 45, this means more efficient pack carry, more mileage, and a lifetime of adventures. Less pack weight also means more room for the essentials—like melted chocolate bars and squished PB&Js.

At 45 liters, the Mayhem 45 is designed for one to three night backpacking trips, backcountry huts trips, gear heavy days at the crag, and adventure travel. The hybrid top and panel opening offers easy access to the front of the pack, a must-have for tight environments and organized packing. Toss the Mayhem on your back and the hex-ridged EVA backpanel padding allows for omni-directional airflow while the sock-style shoulder strap construction prevents the straps from digging into your body. The Interfaced Waistbelt system is designed and patterned to flow into the backpanel allowing for a lightweight but intimate suspension fit and high levels of stability and comfort.

•Front panel expansion pocket with daisy chain attachment loops and built in haul handleDual density EVA

•/PU shoulder straps with load lifter adjustment

•Forward pull waistbelt with side adjustment webbing Ventilated waistbelt padding

•Stretch mesh waistbelt pockets

•Top lid zippered compartment with secondary pocket underneath

•Side panel mesh bottle pockets with Over/Under strap pass thru

•Dual tool / trekking pole carry with elastic pole tip loops

•Ice & mixed tool lower panel pass-thru sleeves


•210d HT Nylon w/ 200d SPECTRA® R/S

•210d Nylon Embossed Liner

•2mm Spring Steel


•Dimensions: 26" x 11.5" x 8.25" (H x W x D)

•Torso size: 16" - 20"

•Waistbelt: 28" - 48"


•2675 cubic inches / 44 L


•Up to 45 lbs 


•2 lbs 15 oz / 1.33 kg 

•Style: 19-50301

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