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For huge day tours and ultralight multi-day excursions, the Black Diamond Axiom 40 Backpack carries the essentials in comfort thanks to its innovative suspension system. The adjustable volume and multiple stretch pockets let you fine tune the pack for different trips, nd the breathable mesh harness and venting back panel keep you cool on long, sweltering days in the backcountry.

  • reACTIV suspension uses soft, floating hip-belt and venting OpenAir back panel for supreme comfort
  • Roll-top pocket and removable lid make for easy volume adjustment on ultralight treks
  • Loops accommodate ice axes or trekking pole for four-season versatility

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Black Diamond Axiom 40 Backpack - 2440-2563cu in

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Here's what others have to say...

3 5

Decent for short trips

  • Familiarity: I've used it once or twice and have initial impressions

I used this pack on the Babel Tower Trail in Linville Gorge. We did 8 miles total and I was fairly pleased with how the pack performed. I was carrying about 25lbs and the pack was quite comfortable, but I do have some complaints...

This pack really needs some type of external gear loops or tie-downs in addition to the ice axe/trekking pole loops. I had to rig some para cord up to tie my sleeping pad to the pack. Some additional loops would be quite functional.

Also, I'm concerned about the durability of the "stretchy" material used for the water bottle pockets and the large pocket on the front of the pack. Time will tell how resilient this material is.

2 5

disappointed with bd

Pack looks and feels great.
but does not have a bladder pouch/pocket. just a strap to keep it in place.
top lid/pouch does not stay in place. the straps that connect it to the pack (closest to shoulders when worn) easily loosens. the lid droops down.

disappointed with bd

I experienced similar performance on my women's version of this pack. I sold it.

Are those water bottle pockets on each...

Are those water bottle pockets on each side? Can you fit a nalgene in each easily or is it a tight squeeze?

The water bottle pockets are on both sides.

You can fit a Nalgene, but depending on how packed your pack is, it can be a tight squeeze. It keeps it from falling out easily.

@Michael Kisow, yes those pockets do accomodate a Nalgene, but can't tell you how many times I've bent over and had mine fall out. It's a royal pain in the a$$. Not well designed in my opinion. I just sold my women's version of this pack because I thought I could do better.

5 5

Awesome pack!

Awesome pack! Super comfortable and has all the key features while still keeping the pack clean of unnecessary straps. Cant go wrong with Black Diamond!

2 5

Back panel bulges and deforms when loaded

Nice looking pack with cool features .. but .. the back panel is made of very thin plastic material. When you load up the pack the panel pops out and doesn't properly conform to the lumbar areas. The BD Boost and Infinity have a thicker panel which does not seem to have this issue.

4 5


Only had the chance to pack it up and put it on seconds after I got. At first try its amazing how well it transfers weight to the hips and the reactiv technology is amazing. This pack really moves with you can't wait to try it out in the woods!

Alright got to try this out on a quick overnight. This pack is super comfortable and having the shoulders move with you makes a huge difference! I barley noticed having it during the three mile hike to out campsite.

Black Diamond Launch and Enduro Series Packs ? Pack Fitting

Correct fit is paramount to realizing the performance benefits of Active Form Design. Determine your pack size at a retailer using Black Diamonds Pack Fit Tool or have a friend measure your torso length. Confused? Watch our pack fit video to learn the proper way to determine your pack size and then fine-tune your fit.

2010 Black Diamond Active Form Design Packs - Research and Development

20 years in the making. Black Diamond's experience with climbing hardware design, from carabiners to crampons, gives us a unique perspective from which to approach pack design. Watch our Behind-the-Scenes video to get the inside beta on the R&D process from our pack designers—all the way from concept sketches to field-testing.

5 5

Black Diamond Axiom 40 Backpack - 2440-2563cu in

BD is on the ball with their new reACTIV suspension system. It allows the pack to stay snug on your back but still allows free movement of the shoulders. This will reduce the amount of shoulder fatigue and won't make you feel like you have a piece of plywood strapped to your back.

The pack is super comfortable and the openair back panel keeps your back from getting all sweaty.

This pack also comes in a 30L. Item# BLD1172 and a women's version. Item# BLD1175