The Black Diamond Cirque 45 Backpack is designed for back-country skiing and ski mountaineering. This streamlined model also comes in smaller 35 and 30 liter options. I started testing this pack while teaching avalanche courses last winter and after a couple more trips this season I’m ready to share my opinions on this model.
Capacity
At 45 liters (2746 cubic inches) this is one of the largest ski packs I’ve tested. It can definitely handle carrying my full avy kit along with my technical gear on ski mountaineering trips. If just sticking to skiing it can easily accommodate my sleeping bag and ultra-light tent for lightweight overnight missions. There is an external helmet carry system that frees up space inside the pack. The dedicated internal avalanche gear pocket is quite large easily accepting my avalanche shovel in my fleet along with my avalanche probe and snow saw. Four side compression straps and the top strap help the pack compress down to bullet size when going on less gear intensive outings.
Fit/Comfort
The Black Diamond Cirque 45’s carrying system is simple, well designed, and snow friendly. The back panel has a gel-like foam (not a removable pad unfortunately) and perfectly contoured shoulder straps along with a well fitting thin foam waist belt. It comes in a “S/M” for torsos from 16-19 inches and a “M/L” for torsos 18.5 to 21.5 inches. I went with the “M/L” for my 19 inch torso 5’9″ build and it fit great. The pack rides well both when climbing (plenty of clearance for helmet) and while skiing (hugs body nicely).
Durability
After a dozen or so ski tours the pack is holding up great. The main pack material (Dynex (210 denier) feels soft to the touch and bottom is heavily reinforced (with PE 200 denier). I’ve packed ice screws, mountaineering crampons, and strapped my skis diagonally and “A-frame” and there is not a single noticeable wear point anywhere.
Features
There’s some things I really like about this pack and some areas that could use some improving. Let’s start with the good!
- Stretch woven hip pocket (only on 35 and 45 liter models). I’m always looking for the best place to put my sunglasses when it is time to switch over to goggles and this pocket fits them perfectly! I’m not sure that Black Diamond intended for this waist belt pocket to hold sunglasses but it is the perfect shape and has a little rigidness to it that makes them feel quite protected even when not in a dedicated case.
Black Diamond Cirque 45 Backpack Stretch Hip Pocket - Stow-able Helmet Carry (also only on 35 and 45 liter models). On less gear intense missions I like to carry my helmet inside the main compartment but when I have more stuff to carry this helmet carry system is quickly deploy-able freeing up lots of internal space.
Black Diamond Cirque 45 Backpack Helmet Carrying System - Compatible with the AvaLung Element for additional protection in avalanche terrain.
- Side zipper access! Not mentioned in the description or in any other reviews I’ve seen for this pack is the side zipper access. I love being able to pack top-loading packs like this to the brim yet still dig out my water bottle or first aid kit without dumping the whole pack. Side zipper access rules!
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Improvements
I really only have one small gripe about the design of this pack, and it’s related to the avalanche gear pocket. Accessing it requires opening the top main compartment, then unbuckling the internal pocket. This isn’t a huge deal breaker but I really prefer avalanche gear pockets to be accessible without entering the main pack. External avalanche gear pockets are much more convenient if you access these tools throughout your tour when making observations (it’s not just about rescue speed). Other than that this is a really well put together ski touring/mountaineering backpack and one worth a close look!
Other Media
Thanks for reading!
See you in the mountains,
Northeast Alpine Start
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Northeast Alpine Start 
I have the 35 liter version of the pack and love it. I find it interesting that you don’t even mention the most unique and defining feature of the pack, the top closure and lack of lid/brain. I personally love this feature ave it makes it super easy to get into the main compartment quickly.
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Thanks for commenting Charlie! That is a unique feature to this pack and I’m glad you called attention to it!
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On this pack: do you have any idea on the function of the small strap with a clip that is hidden under the black flap that protects the pickaxe? It appears to be accessible through a slit in the flap, but I can’t figure out its function.
Thanks
alvise
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Could anyone provide the dimensions for the S/M (and L/M if possible) version – height, width and length, as I’m struggling to find these listed anywhere.
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