Arc'teryx Aerios Daypack 14 - 854cu in - 2010 BCS

I've replaced my Mt Bike packs with the Arc'teryx Aerios 14, and am really happy with it. I tend to carry too much stuff when I ride and this size works great without being bulky and stiff. The back panel on this pack is made with a molded mesh that doesn't absorb moisture, and let's air flow freely. I actually felt a breeze blowing across my back on ridgelines. I can stop for a break, my wicking shirt dries fast and the back panel doesn't get me wet again as soon as I put it back on. The shoulder straps are perforated and also dry super quick and let heat escape-Sweet! This rig also has a nice frame with molded cross stays, so when I pack it full it, it stays flat and doesn't dig into my spine. The big mesh panel is great for quick access and the bungees work in a variety of configurations to compress the pack or carry a helmet. Dig it!

This pack has great potential for both adventure race pack and bike pack. I've used for entier summer and found it very useful. The only downside is the side pockets - it doesn't have any mechanism to keep them shut, and due to the slick material anything (ie energy gel, gps, compass) will fly out. Not sure why Arc didn't add streach material to keep the pocket shut / use mesh instead. This is the only drawback.
I'm retiring this pack now, since I got Axios 25 and Aerios 7 - Aerios 14 is too big for my running, and too small to be used on my travel needs.

http://www.youtube.com/watch?v=wEP4ObeXasQ

For a small pack this design holds a ton of stuff. I use it for everyday, and as a carry on when flying which is deceiving since I can stuff everything except the computer in the pack. Very durable, I throw it around, no concerns, typical Arc'teryx. I really like the design, normally I like technical packs but this bag is a light version with a lot of room, expandable with the outside cord and big outside sleeve.

I used this pack for a fastpack trip into the Uintas. We took only what we needed for a very minimalist run in and out, with a planned overnight. It was just the right size to hold a lightweight sleeping bag, food, a down sweater, and extra pair of socks, but with all that it was packed super tight. I took two water bottles and a steripen for water - no bladder. With the pack so full, I couldn't get water bottles into the side pockets. An elastic or stretch material on these would be a much better design. As it was, I squeezed one bottle in one side and stuffed the other in the top front pocket. That worked ok, but as I was running over the uneven trail, the bottle fell out a few times. The other thing I'd change is the waist belt. It's very light elastic, so while it serves to keep the pack from flying around, it provides zero support. You carry all the weight on your shoulders. Not a huge deal because it's not made to carry heavy, but it did wear on me after about 30 miles. Overall, this is a sweet little pack. I really like it and would definitely recommend it.

http://www.youtube.com/watch?v=wEP4ObeXasQ

I got the Arc'teryx Aerios Daypack 14 a couple months ago and it's been a great pack for me so far. It is super light, comfortable and holds much more stuff than I would have expected thanks to its external bungees. I pulled my hydration bladder from my old Camelbak, and dropped it into the Aerios 14 with no problem - there is plenty of room for an emergency rain shell, all my tools, pump, extra tubes, some snacks and my pads fit nicely under the external bungees. When I transferred all my equipment from my Camelbak, I thought I was just going to "test" it out as a mtb pack; however, now that I've used it for 15 rides I am convinced that the Aerios 14 is a great mountain bike pack.