For the past two years I've mostly used a Cilogear 45 liter Worksack, the standard fabric (Dimension Polyant VX21/VX42) pack not the holycow-is-that-badarse W/NWD Dyneema, and generally like it. For alpine backpacking I give it a 3.9 out of 5.
Fit: I love the harness. It's simple and feels very natural to wear. The hipbelt is similar in that it's not overly done and forms around by hips and locks the pack in place. The belt slips behind a lower slim lumber pad and is attached with Velcro, which can be adjusted a couple of inches up or down to fine tune the length of the torso a bit.
Once you bend the stay/framesheet to your curves you don't feel this pack on your back. For me, the fit of this pack is its best attribute.
Features: I don't use the lid. I prefer the draw cord closure style of packs over the ever so popular dry bag style. Cilogear does the draw cord closure well. It has a spindrift extension to the collar, which I like. The cinch cords are offset from the center of the pack a bit which is a really good idea.
The fact that you can pretty much set up the compression straps any which way you like is pretty cool, but in practice I only configure it one way. I do like to have the option for lashing poky and bulky items to the exterior of the pack though.
There are no pockets on the exterior of the pack. I had Zimmerbuilt make a couple of VX21 side pockets for water bottles that work very well. I don't always use them, but for trips that require more carried water they rock.
The small interior "ninja" pocket is very useful for things like your cash, ID/cards, keys, headlamp, knife, lighter, etc.
The ice axe/tech tools attachment is the best I've used on any pack. What's more, when not carrying tools they're very low profile.
I love that I can strip down the pack, especially the frame components, in a matter of seconds. The framesheet padding pulls out and completes my ground insulation. It's nice for sitting on cold hard rock, snow, and ice too. Many of times I've ditched the framsheet, collapsed the pack, removed the hipbelt, and used the pack as a simple summit pack. Perfect for setting up camp in that high alpine basin and then scrambling to a nearby peak with a jacket, water, and dinner to watch the sunset.
Carry: I've probably never carried more than 35 lbs in the pack, so I haven't exactly tested it's limits, but it was absolutely fine at that weight. I'm normally carrying around 20-25 lbs at the start of a trip and it feels great. It has all the standard adjustments (i.e. hipbelt stabilizer straps, load lifters, chest strap) so you can shift things around if needed. I think that fact that you can custom bend the stay to hug the curve of your back makes a huge difference. The pack doesn't want to slide down, since it's contacting the curve of your spine and not just being suspended on your hips. The pack feels very stable on your back when scrambling.
Size: The 45 liter is HUGE. I store a medium length Ridgerest inside the pack, with a BV450, no lid, solo, and still have room left over when carrying high Sierra shoulder season gear. While the pack never feels "bulky," I wouldn't mind it being a tad smaller in depth. The collar, and futher spindrift collar, allows over stuffing if needed.
Durability: It's burly enough for rough mountaineering and absolutly bomb proof for backpacking. Essentially overbuilt for on-trail backpacking. I beat the crap out of this pack on Sierra granite and it looks new. I've used it for airline/train/bus travel and it still looks new.
While it's a respectable weight for a burly mountaineering pack, it's heavier than what most would need for backpacking. I'm constantly trying out lighter options with the most recent being an Exped Lighting 45, but I'll probably end up selling it soon to try out a HMG Porter. If that doesn't work out I'll still have the trusty Worksack.
