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It's about keeping comfortable in a hostile world.

The Black Diamond Mercury 65 is the middle child in the Mercury multi-day Backpack series. The full-featured Mercury 65 will carry everything you need for a four- or five-day trip into the backcountry.

  • ergoActive XP suspension blends full-range motion with stable support for heavier loads on multi-day trips
  • ergoActive XP hipbelt uses urethane elastomers for added stability and dynamic load transfer
  • OpenAir back panel promotes cooling airflow to keep your back dry and comfortable
  • Compartment divider helps keep you organized
  • Side and hipbelt pockets for easy access to the essentials
  • Hydration compatible to keep you moving on long hikes
  • Retractable trekking pole/ice axe loop is out of the way when you don't need it
  • Sleeping pad straps save interior room

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Black Diamond Mercury 65 Backpack - 3967cu in

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Here's what others have to say...

Is this pack suitable for overnighters or shorter trips also??


You can definitely use this as an over night pack and on shorter trips. It's meant to handle heavy loads.

Depending on what you're taking, sometimes it is beneficial to go with a pack more in the 50 liter range. But this would be based on how much gear you plan on taking.

I've done over night and 2 night trips with a 25 liter pack and then other times I've used 50 liter packs and bigger for longer trips.

Shoot me an email anytime you have questions!

Jared D.
Expert Gearhead

Great Pack with One Minor Drawback

The Black Diamond Mercury 65 Pack is a good option. With the Black Diamond Mercury 65 Pack you are getting decent weight, lots of organization, great waist support and a solidly made pack. The one thing with this Black Diamond Mercury 65 Pack is the waist support. It rotates around, so if you are hiking and are going through some terrain like rocks, hills, etc. the Black Diamond Mercury 65 Pack moves with your movements, versus the pack moving in a solid way. It is quite different feeling, but in a good way. You will find plenty of storage mesh compartments throughout, and two outside water bottle holders. I travel with a saw and an axe and used the provided hiking pole holder for my axe and it worked great. This Black Diamond Mercury 65 Pack has lots of compression straps, so whatever you put in there you can compress it easily.

The one area I see for improvement is the zippers. The Black Diamond Mercury 65 Pack has waterproof zippers on it and they are a pain. Difficult to open, they get stuck at times and worst of all I have had some pop. Now I got them back on track with a simple zip and unzip, but they did pop. Could be the load I had in it and pushing limits, but these zippers need to be changed to challenge for a top notch backpack. On a smaller critique, the shoulder straps are narrow and could be enlarged to distribute the weight better across the shoulders. All in all, I do enjoy using the Black Diamond Mercury 65 Pack, but I am mindful of not going above 35 pounds. I have found that is the magic number. Getting much above that leads to shoulder strain. But around 35 pounds and this pack is killing it all day everyday. Also, bravo Black Diamond for using a mud color, similar to a dark coyote brown color. Many manufactures use bright colors, but people like me like just a simple brown or green. I am glad to see this type of color. Berz Rating: 83/100

Unanswered Question

What size and brand water bladder will fit this pack best?

Across the world and back

Across the world and back

This backpack went through a total of 9 airports and flights with no protective case and remained completely unscathed. It also made it through the entire annapurna circuit without ever using a backpack cover (sunny skies for 21 days straight) and didn't loose its charm, great backpack!

Unanswered Question

Hey !
I have a question about this...

Hey !
I have a question about this bag.
First it's about the size. My size is 5.9 feet, my torso is 19.6 inch and my waist is 32.6 inch. So I must take the size M right ?
And also, i would ust this bag not only for trek, but for travelling several weeks. Do you think the 65L will be enough ? Or it's better if i choose the 75 L ?
Thank you very much !

5 5

Just a great pack

  • Familiarity: I've used it several times

No matter what size pack you carry, you're always going to jam it to capacity for overnight and multi-day trips, and the 65L Mercury hits that sweet spot of being able to accomodate pretty much any kind of trip. Love the black diamond ergo-fit system for the lower back and hips, and also another great feature of thi pack is the ability to get into it from the outside, without having to go from the top. I'll use this pack till it falls apart.

Hi guys, I have a 40L black diamond pack...

Hi guys, I have a 40L black diamond pack (Axiom). I love the minamalist design, and it has been a pretty good pack. My issue with it has been this: the straps that stabilize the brain are very loose and do not hold any weight in the top pouch. Meaning that the plastic pieces that "lock" the straps in place do not hold the straps. Does this pack have the same problem?

Hey Matt,

I hear what you are saying and honestly you will probably have the same issue here since its really a similar design. In fact, since the top lid if further away from where it is secured to, if you are putting heavy items in that top lid you will probably have more of this issue that you did in the Axiom. The thing is that top lid really wasn't designed to have a lot of weight in it, most of the weight of the pack is expected to be down more towards your lumbar area. That top lid is just supposed to be lighter frequently used or emergency items like maps, quick snacks, rain gear, and first aid kits. You in all honesty probably shouldn't have much more than 5 lbs in that area.

The Axiom used different buckles and a thinner style of webbing. I don't think the Mercury top pocket will slip at all.

5 5

Perfect for Multi-Day Trips.

I've been throughly satisfied with this pack for many different reasons.

1. The waist belt rotates, which means it moves with your hips every time you take a step which feels very natural and ergonomic.
2. The pack has an internal metal frame that is very secure and sturdy, providing extra support.
3. The huge access point in the middle is perfect for grabbing something that is in the middle or bottom of your pack.
4. Very well padded. Very comfortable around the waist and the waist belt has two small pockets for a small tube of sunscreen or a couple clif bars. I was able to fit two clif bars into each pocket for easy access.
5. There are two large external pockets on either side of the pack, large enough to hold a 32 oz. Nalgene.

Overall, I'd recommend this pack to anybody who's looking for a solid weekend backpacking trip.

5 5

Great Pack

I bought this pack and so far I've been impressed. All the zippers are taped and everything is made well. I took it out on a 8.5 mile hike up Wildrose Peak in Death Valley. The pack road well and it was easy to adjust for comfort. Also, the pivoting hip belt and load adjusting cables move with you and feel natural. The side pockets are stretchy which allows you to put stuff in them even when the pack is full. Also, I liked how the pockets on the hip belt are easily accessible. I've had other packs where the pockets could not be reached very well. Finally just for some extra info the hip belt doesn't come attached. It is easy to attach but you may not realize the tool is in a pocket. I didn't realize that and I went and got an alan wrench from my garage when there was one with me the whole time.

Great Pack

Can I lock this pack w. luggage locks,...

Can I lock this pack w. luggage locks, like the Master type?

You could put a lock on the zippers but it really wouldn't lock the main compartment. From the top it uses a draw string like many other bags. From the side access to the main compartment and other pockets there are zippers and a lock could be put on these. However, the pull tabs are strings and could easily be cut.

You could put a lock on the zippers but it really wouldn't lock the main compartment. From the top it uses a draw string like many other bags. From the side access to the main compartment and other pockets there are zippers and a lock could be put on these. However, the pull tabs are strings and could easily be cut.

Technically, you can but if the robber was determined, he can just cut the straps that you put the lock onto. There are no metal pull tabs to put a lock on.

What sort of weight can this pack comfortably...

What sort of weight can this pack comfortably hold? Is, say, 40lb a problem?

Best Answer

40 lbs should be doable. I'd take care in how you pack it in order to comfortably distribute the load.

I've hiked with 40 pounds of gear/food in this bag no problem. Just make sure to put all your heavy items in the bottom/back section of the bag.

5 5

Like carrying a cloud

I know, pretty broad statement, right? Well, that's what it felt like on a 8-day trip in the Pyrenees. At first, I was a little concerned if the 65 might hold all the backpacking (2P tent, sleeping bag and pad, clothing, rain gear, food), plus camera equipment (tripod, body, 4 lenses and accessories) for a week-long trip but the Mercury did awesome.

+ Back ventilation was superb, even in the 90 degree temperatures on the valley floors.
+ The ErgoActiv system worked as it is supposed to and exceeded my expectations. It moved really well with me on the narrow Pyrenean trails and scree sections, while always being supportive and feeling well designed, something I wouldn't say about another manufacturer other than BD.
+ Shoulder straps felt a little stiff at first but after a couple of miles, they wear in and you appreciate the support of the Swing Arm technology. Overall, the pack felt much lighter than it actually was (mid 40lbs. range I would guess) and I have to applaud Black Diamond (again) for designing a pack that allows you to hike more miles with seemingly less weight to carry.
+ The removable hip belt is gold when air travel is involved. You can board the plane knowing you can attach the hip belt once you picked up your pack, nothing gets ripped off. Easy call. The hex key stores away in the right pocket of the belt - perfect.
+ The hiking pole loops are cleverly designed and so are the additional straps that just store away in little pockets under the top lid and in the smaller front compartment, which is large enough to fit rain jacket and pants, maps, etc. at the same time for easy access.

Easily the best backpack I ever carried and I wouldn't hesitate recommending it.

Oh, and I got the Stone color, which is actually a little more on the olive-ish green side, yet, a color I would still classify as brown, just with said super light olive-ish color cast.

does the mercury 65 have sleeping pad...

does the mercury 65 have sleeping pad straps? i see two straps on the bottom of the pack that could be sleeping pad straps.

I am still trying to find a flaw with this...

I am still trying to find a flaw with this pack, it seems perfect!! Am I wrong?

It has no mechanism for transmitting tree locations to blind hikers.

Your review pushed me over the top. I am headed to the south pacific for 60+ days and this and a Maxpedition Mongo will be my capacity for life on the tropical beaches and jungles. Thanks.