Black Diamond Mercury 55

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This is one of my favorite packs... super comfortable,…

Rating: rated 4.5 of 5 stars
Source: tested or reviewed it for the manufacturer (Keep)


This is one of my favorite packs... super comfortable, and well-designed. The pivoting hip belt on the Mercury 55 is perfect and much better than some of the other packs I've tried. See my full video review to learn more.


  • Comfortable
  • Great storage design
  • Pivoting hip belt


  • Small size is best for short trips

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Retailers' Descriptions

Here's what other sites are saying:

Free Shipping. Black Diamond Mercury 55 Pack FEATURES of the Black Diamond Men's Mercury 55 Pack Ergo active XP suspension with OpenAir back panel Top-loading with floating top pocket, Plus front zippered access Waterproof taping on top and bottom Compartment divider, Side and hip belt pockets, Front and internal organizer pockets Retractable trekking pole/ice axe loop, Sleeping pad straps, Hydration compatible Also available as women's-specific Onyx SPECIFICATIONS of the Black Diamond Men's Mercury 55 Pack 400D polyester twill + 420D nylon twill The SPECS for Medium Volume: 3.356 cubic inches / 55 liter Average Stock Weight: 4 lbs 9 oz / 2.10 kg The SPECS for Large Volume: 3.478 cubic inches / 57 liter Average Stock Weight: 4 lbs 11 oz / 2.14 kg

- Moosejaw

For your longer trips, Black Diamond provides the Mercury 55. A full-featured multi-day pack with lots of storage space. This top loader has a full front zippered access panel so you can access the heart of your pack without having to pull everything out first. Waterproof taping on the top and bottom of the pack give extra protection against the elements. The ergoACTIV XP frame moves with you using a ball and socket joint, creating a free rotating waist belt to give you complete freedom of movement.

- Mountain Gear

The Black Diamond Mercury 55 Backpack is the smallest in the Mercury series, but it boasts the same features as its bigger brothers. The 55L Mercury is best suited to two or three days trips where comfort and pack versatility are priorities.


The Black Diamond Mercury 55 pack features an active suspension and harness system that offer excellent load support and a wide range of free mobility for the wearer over long miles on rough trails. Patent-pending ergoACTIV hipbelt, breathable back panel and soft, 3D mesh lining on hipbelt and shoulder straps provide top-notch support and comfort. SwingArm(TM) shoulder straps move in concert with a hiker's stride or a climber's reach by sliding through the bottom of the pack with a low-friction cable and housing. Shoulder straps are linked to the other by the cable which helps maintain an even, balanced load across the shoulders. An ideal blend of volume, comfort and mobility lets you bring everything you need without slowing you down or limiting your range of motion. Top-loading pack body features a floating lid to accommodate large or small loads; giant U-shape front-panel zipper offers easy access to main compartment. Hydration compatibility lets you add a reservoir of your choice (reservoir sold separately). Hipbelt stash pocket, side stretch pockets and large zippered front pocket offer plenty of storage for water bottles, snacks and other essentials. Waterproof taping on the top and bottom seams helps keep contents dry. The Black Diamond Mercury 55 pack features retractable tool loops that allow ice axes or trekking poles to be lashed to the outside of the pack.


The Mecury 55 Pack from Black Diamond features their ergoACTIV XP suspension system using a custom, 3D pivoting hipbelt and SwingArm shoulder straps for increased stability and dynamic load transfer. Built for rough trails, big-mileage days and maximum comfort over the long haul; combines classic backpacking features with sleek, modern designs and unparalleled freedom of movement. The front zippered panel gives you full access to the inside, while multiple pockets, dividers and straps help secure and organize your gear during extended trips.