I just used the Arc'teryx Silo 40 Backpack for a two day tour in the backcountry and I really like the suspension and frame on the pack - heavier loads were no problem at all. There is a good hydration system and access is nice via a side loading front pocket and top loading main compartment. I think the closure system on the top is a hassle but it does keep snow out (I planted my head about 4 feet into a wind drift and everything stayed dry). The ski carry could also use improvement but is functional enough.

I own this pack in size 'short' - it took me all winter and most of spring and summer to finally locate a good backcountry board pack and buy it. So far I've only used it to climb a technical peak, and while it isn't really a climbing pack (a little heavy), it was the perfect size for a summer bivy trip and extremely comfortable (I also own the bigger women's Bora pack, also very comfortable) despite being very full while climbing 5th class and hopping over mile-long talus and boulder fields. I actually really like the rolltop so far- it does take two hands (vs. zippered packs), but opens up all the way instantly. The shape of it (wide at top, narrow at the bottom) makes it very easy to 1)pack it; 2)find/feel for things inside it; and 3)unpack it. Also, the burly straps for gear/snowboard look like they will hold up much longer than straps on other packs I was looking at (i.e. osprey switch 25 or 36). I originally bought the BCA stash BC rider pack, but it was WAY too long (I am almost 5'5"). One thing I noticed but don't care about at all is that you can't really overstuff this pack- the roll top closure doesn't really work if you have too much stuff in it, and it is a little harder to cram shut.
--and now, an addition to the review--
its summer now and I used the pack all winter. I
couldn't be happier. I have noticed that I have to pack my shovel and probe carefully so that the everything makes it out of that outside pocket effortlessly (time is life). However I have a longer probe and a large-ish shovel (blackdiamond guide 300cm and T7).

Super comfy, bullet proof construction and if you have issues, Arc'teryx has customer service right up there w/ backcountry.com. Been attaching my board to this pack all winter and the system is holding up like new! Fish-mouth opening makes it so easy to pack and offers great accessibility to anywhere within the pack. Really slick design and clean-looking; not too much going on on the outside so you don't look like you belong in the Himalayas.

So Red Beryl is just a fancy name for bright pumpkin orange. This pack was fantastic, but I couldn't stand the orange color (maybe it was the red straps across the orange that were really offensive). If you like orange this pack is for you. If orange is not your thing, you'll definitely like titanium better. It's a great pack--just a bad color.

i was almost put off buying this pack because i'm not made of money, but i'm so glad i got it. it has everything i wanted and is a great day pack for any activity out in the winter weather. i use it for work and play in the mountains!